7 Best Filter Bottle for Backpacking in 2026 (UK Tested Picks)

Somewhere around hour six of a soggy day on the Pennine Way, you stop caring about scenery and start caring about one thing only: whether the beck you’re crouched next to is going to make you ill. A filter bottle for backpacking solves that particular anxiety in seconds rather than minutes, turning brown, peaty upland water into something you’d happily hand to your gran. It’s a small, screw-top piece of kit — usually a soft flask or hard bottle with a hollow-fibre or carbon cartridge built into the lid or straw — that strips out bacteria, protozoa and often microplastics as you drink or squeeze.

That’s the strict definition. The more useful truth is that not all filter bottles are built the same, and the difference between a £30 squeeze system and a £95 purifier isn’t marketing fluff — it’s what pathogens each one can actually stop. Choose wrong and you’re either carrying dead weight for a weekend in the Lakes, or worse, trusting a bottle that was never rated to deal with the water source in front of you.

This guide leans on real product specs, genuinely aggregated review sentiment, and honest comparative analysis rather than recycled listing copy, because that’s what UK hikers heading onto exposed, remote sections of terrain actually need. We’ve pulled together seven real, currently available products spanning budget squeeze filters right up to full virus-rated purifiers, tested them against each other on flow rate, filtration standard, weight and real-world running cost, and built in practical guidance for refilling from streams safely on the National Trails of England and Wales and beyond.

Quick Comparison Table

Looking at the spread above, the gap between a basic bacteria-and-protozoa filter and a true purifier like the GRAYL GeoPress or Water-to-Go Active comes down almost entirely to virus removal — largely irrelevant on a British hillside, genuinely important if that same bottle is coming to South East Asia with you next spring. Budget-conscious weekend walkers can comfortably stop at the Sawyer Squeeze or Katadyn BeFree, while anyone planning a multi-week thru-hike where cartridge cost adds up should weight their decision toward filters that never need replacing rather than the cheapest upfront price. Price ranges shown are indicative and checked at the time of research; always confirm the current price before buying.

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Top 7 Filter Bottles for Backpacking: Expert Analysis

1. Katadyn BeFree 1L — lightest squeeze filter for fast refills

The headline figure here is speed: independent testers have clocked the BeFree filtering a full litre in around 30 seconds, which is genuinely one of the fastest flow rates of any hollow-fibre squeeze filter on the market. The 0.1-micron EZ-Clean membrane strips out bacteria and protozoa like Giardia and Cryptosporidium without a single moving part, and Katadyn rates the cartridge for up to 1,000 litres before it needs replacing.

Based on the spec comparison with rival squeeze systems, what stands out about the BeFree isn’t the filtration standard — several competitors match it — it’s the weight. The 0.6L version tips the scales at roughly 59-67 grams including the soft flask, which matters enormously if you’re counting grams on a multi-week trail rather than a weekend out. This is a filter for people who’ve already decided speed and pack weight beat everything else, including durability.

Reviewers consistently report that the soft HydraPak flask is the weak point rather than the filter itself — several UK hikers testing it on Dartmoor and in the Lake District noted the lid doesn’t always seal perfectly when packed wet, and the pouch material can develop pinholes with rough handling over a season of use. Cleaning couldn’t be simpler, though: no backflushing kit required, just shake or swish the membrane in clean water.

Pros:

• ✅ Roughly 2 litres per minute flow rate, among the fastest squeeze filters
• ✅ Ultralight design, the 0.6L version weighs well under 100g
• ✅ EZ-Clean membrane needs only a shake or swish, no backflush kit

Cons:

• ❌ Soft flask reservoir is prone to punctures with rough handling
• ❌ Lid doesn’t seal perfectly for some owners, occasional leaks reported

At around £40-£45, the Katadyn BeFree 1L sits mid-pack on price but wins hands-down on the weight-to-performance ratio, making it a strong pick for anyone prioritising a light pack over long-term durability.

2. LifeStraw Go Series 650ml — best all-rounder for UK day hikes

LifeStraw built its name on the standalone straw filter, and the Go Series bottle takes that same 0.2-micron hollow-fibre membrane and pairs it with a secondary activated carbon capsule, which is a smart bit of engineering most rivals skip. The membrane physically blocks bacteria including E. coli and Salmonella, and parasites including Giardia and Cryptosporidium, while the carbon stage strips out chlorine taste and organic odours that plain membrane filters leave behind.

What most buyers overlook about this bottle is that its two filters age at wildly different rates. The membrane microfilter is rated for roughly 4,000 litres — about five years of daily use — while the carbon capsule needs replacing every 100 litres, or roughly seven weeks of regular use, with replacement two-packs running around £12 on Amazon. That’s a genuinely useful thing to know before you buy, because it changes the real running cost of the bottle over a season.

Aggregated customer feedback highlights bottle usability and ergonomics most consistently, with reviewers repeatedly praising the handle and overall size for everyday carry as well as trail use. It’s worth being clear-eyed about one limitation: unlike the purifier-rated bottles further down this list, the Go Series does not filter viruses, which rules it out as a sole solution for international travel to regions with viral waterborne disease risk, even though it’s more than adequate for UK stream and tap water.

Pros:

• ✅ Two-stage membrane plus carbon filter tackles both safety and taste
• ✅ Membrane rated to filter around 4,000 litres, years of daily use
• ✅ Consistently praised for comfortable, ergonomic everyday carry

Cons:

• ❌ Carbon filter needs replacing roughly every 100 litres or seven weeks
• ❌ Doesn’t filter viruses, only bacteria, parasites and microplastics

Priced in the £38-£48 range depending on colour, the LifeStraw Go Series earns its reputation as the sensible middle-ground pick — safe for essentially all UK hiking water sources and light enough for daily carry too.

3. Sawyer Squeeze Water Filtration System — cheapest long-term cost per litre

Here’s what the spec sheet won’t tell you outright: the Sawyer Squeeze has effectively no consumable cost after the initial purchase. Unlike every cartridge-based bottle on this list, the 0.1-micron hollow-fibre filter never needs replacing — you simply backflush it with the included syringe when flow slows, and Sawyer’s own testing shows this restores up to 98% of original flow rate. Over a multi-month thru-hike, that difference in running cost against a cartridge system adds up fast.

The filtration numbers themselves are formidable: independent lab testing puts bacteria removal at 99.99999% and protozoa removal at 99.9999%, on par with or ahead of pricier purpose-built bottles. It also threads directly onto standard 28mm soda and water bottles, screws into hydration reservoirs, and can be rigged as a gravity filter — genuine flexibility that suits people who like to build their own hydration system rather than buy a sealed one.

A common complaint in user reviews is the included 32oz squeeze pouches, which several long-distance hikers describe as the flimsiest part of the whole system, prone to splitting at the seams after months of daily squeezing. Most experienced users end up pairing the filter with a sturdier third-party pouch or a standard plastic bottle instead, which is a small extra cost worth factoring in.

Pros:

• ✅ No replacement cartridges ever needed, just backflush to restore flow
• ✅ Removes 99.99999% of bacteria and 99.9999% of protozoa
• ✅ Threads onto standard bottles, reservoirs and gravity setups

Cons:

• ❌ Included pouches are flimsy and prone to splitting with heavy use
• ❌ Flow rate slows noticeably between backflushes as the filter clogs

At around £30-£40, the Sawyer Squeeze is the filter to buy if you hate the idea of ever purchasing a replacement cartridge again — just budget separately for a tougher bottle to squeeze it into.

4. Water-to-Go Active 75cl — British-designed with NASA-derived filter

Water-to-Go is one of the few brands on this list actually built around here, and its 3-in-1 filter — mechanical, electrical and activated carbon layers combined in a single cartridge — was developed from technology originally created for the NASA space programme. That combination is what lets it claim virus removal alongside bacteria and protozoa, a tier most sub-£50 filter bottles simply don’t reach.

Based on the spec comparison, the trade-off for that broader protection is filter lifespan: each cartridge is rated for 200 litres, which the brand estimates as roughly three months of typical daily use at two litres a day, working out to an effective cost of around 5-6p per litre of clean water. That’s shorter than the LifeStraw Go’s carbon stage and considerably shorter than the Sawyer Squeeze’s effectively unlimited membrane, so heavy users will be replacing cartridges more often here.

Reviewers consistently praise the squeeze-to-drink action for rapid delivery and note the bottle’s compatibility with standard bike cages, which makes it a genuine dual-purpose option for cyclists as well as hikers. The 75cl Active model was specifically redesigned to be more translucent and slimline than earlier Water-to-Go bottles, addressing an earlier common complaint about bulk in a backpack side pocket.

Pros:

• ✅ Combines mechanical, electrical and carbon filtration in one cartridge
• ✅ One of very few bottle filters rated to remove viruses too
• ✅ Squeezable, bike-cage compatible design built for active use

Cons:

• ❌ 200-litre filter capacity is shorter-lived than several rivals here
• ❌ Bulkier in the hand than slimline soft-flask style filters

At roughly £28-£35, the Water-to-Go Active is worth a serious look for anyone who wants virus-level protection without stretching to purifier-bottle prices — just budget for filter replacements more often.

5. Lifesystems Water Filter Purifier Bottle 1L — DofE-approved virus protection

Lifesystems is a well-established UK outdoor brand, and this bottle is one of its more technically ambitious releases: a Disruptor fast-flow cartridge using electro-adsorptive technology that filters water as you drink rather than requiring a separate squeeze or press step. Independent testing by an ISO 17025:2017 accredited lab, with the membrane itself tested to NSF 42 and NSF 53 standards, backs claims of 99.99% virus removal, 99.9999% bacteria removal and 99.9% protozoa removal.

What most buyers overlook about this bottle is where it sits in the UK outdoor education world — it carries official Duke of Edinburgh’s Award recommended status, chosen specifically for durability and reliability on DofE expeditions, which says something about how it performs under sustained, unsupervised use by less experienced hikers. The cartridge is rated for 600 litres, comfortably ahead of both the LifeStraw Go’s carbon stage and the Water-to-Go filter.

The trade-off, based on the spec comparison against lighter squeeze filters, is weight and drag: at 255-260 grams including the cartridge, it’s noticeably heavier than the BeFree or Sawyer Squeeze, and several long-term reviewers mention a period of adjustment to the suck resistance before it starts to feel natural. Cleaning is refreshingly low-effort, though — the cartridge simply pops out for air-drying, no chemicals or dishwasher required.

Pros:

• ✅ Removes viruses, bacteria and protozoa with independently tested cartridge
• ✅ Filters up to 600 litres before the cartridge needs swapping
• ✅ Officially recommended kit for Duke of Edinburgh’s Award expeditions

Cons:

• ❌ At 255-260g it’s one of the heavier bottles in this line-up
• ❌ Noticeable suck resistance until you get used to the flow

Priced around £45-£55, the Lifesystems Water Filter Purifier Bottle is a sound pick for families, younger hikers on structured expeditions, or anyone who wants virus protection without moving up to purifier-bottle pricing.

6. GRAYL GeoPress 710ml — fastest full purification worldwide

If your backpacking plans extend beyond Britain’s reasonably clean upland streams into genuinely unpredictable water — brackish sources, murky rivers, questionable taps abroad — the GeoPress is built for exactly that scenario. Its OnePress cartridge combines electroadsorption with ultra-powdered activated carbon to meet the US EPA’s water purifier standard, removing viruses, bacteria and protozoan cysts in a single 8-second press, alongside filtering out heavy metals, pesticides and microplastics.

Here’s what the spec sheet won’t quite convey until you’ve used one: the press mechanism means there’s no squeezing, sucking or waiting involved. You fill the outer cup, press the inner cup down in one smooth motion, and 710ml of purified water is ready — genuinely the fastest full-purification process of anything on this list, and arguably the reason it’s become such a fixture with international backpackers and journalists working in remote regions.

Reviewers consistently note two things: first, that the pressing action takes real forearm strength, particularly with cold or fatigued hands late in a long day; and second, that it’s simply the bulkiest, heaviest bottle here, which matters if every gram in your pack is under scrutiny. The cartridge is rated for roughly 250 litres (65 gallons), and GRAYL notes water quality affects lifespan — pre-filtering visibly silty water through a cloth before pressing extends cartridge life considerably.

Pros:

• ✅ Press-filters a full 710ml in about 8 seconds, no squeezing needed
• ✅ True purifier standard, removes viruses as well as bacteria and protozoa
• ✅ Cartridge rated for around 250 litres before replacement

Cons:

• ❌ Heaviest and bulkiest bottle in this line-up by some margin
• ❌ Pressing action needs real forearm effort with cold or tired hands

At around £90-£100, the GRAYL GeoPress is a premium buy that makes most sense for backpackers whose trips genuinely leave the UK, or anyone who wants one bottle capable of handling literally any freshwater source on earth.

7. Platypus QuickDraw 1L Microfilter System — most versatile for UK hillwalking

The QuickDraw’s party trick is a double-threaded dirty-water connection, letting the microfilter attach to its own 2-litre reservoir, to standard 28mm bottles including smartwater-style bottles, or inline to compatible hydration reservoirs via the ConnectCap and hose. Platypus rates it at up to 3 litres per minute when squeezed and 1.75 litres per minute in gravity mode, and independent UK hill-walking reviewers have rated it among the fastest, most travel-friendly filters they’ve used across the Lake District, Eryri and the Scottish Munros.

Based on the spec comparison against the Sawyer Squeeze, the filtration standard is essentially matched — both meet the NSF and EPA P231 protocol, removing 99.9999% of bacteria and 99.9% of protozoa — but the QuickDraw pulls ahead on raw flow speed and the versatility of its threading system, while running a noticeably higher cost per litre over the cartridge’s roughly 1,000-litre life, according to UK gear reviewers who’ve compared it directly against straw-style rivals.

Reviewers consistently note that cleaning is simple and tool-free: a shake-to-clean method for light debris, and a proper backflush when flow drops off more seriously. A small minority of buyers report a unit arriving with sluggish flow straight out of the box, which most resolve with an immediate backflush before first use — worth doing as standard practice rather than waiting for a problem on the trail.

Pros:

• ✅ Up to 3 litres per minute squeezed, near the top of the class
• ✅ Threads onto standard 28mm bottles for a flexible, modular setup
• ✅ Tool-free backflush restores flow without buying new cartridges

Cons:

• ❌ Cost per litre runs higher than cartridge-free rivals like Sawyer
• ❌ Occasional units need a backflush out of the box before flow improves

At roughly £55-£70 for the 1-litre system, the Platypus QuickDraw rewards hikers who want a modular setup that can be reconfigured across a squeeze bottle, a gravity bag, or a hydration reservoir depending on the day.

Top 7 Filter Bottles: Specs at a Glance

Weight and flow rate tell almost the whole story of how a bottle will feel on the trail: the lighter squeeze filters like the Katadyn BeFree and Platypus QuickDraw win on pack weight and speed, while the GRAYL GeoPress and Lifesystems bottle trade grams for genuinely broader pathogen protection. If cost-per-litre over a long trip matters more to you than upfront price, the Sawyer Squeeze‘s lack of any replacement cartridge is very hard to beat on paper.

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Setting Up and Maintaining Your Filter Bottle on the Trail

Getting a new filter bottle for backpacking right on day one saves you a lot of frustration later, and most of the mistakes people make are entirely avoidable. Before you ever fill it from a stream, run the first two or three fills through with tap water and discard them — cartridges are often shipped dry or lightly coated in production residue, and that first flush clears it out and confirms the flow rate is what you expected.

A 30-day maintenance rhythm works well for most hollow-fibre filters: backflush weekly if you’re using it daily, or after any noticeably silty fill, since sediment is what actually clogs a membrane rather than the biological contaminants it’s designed to catch. For cartridge-style bottles like the Lifesystems or Water-to-Go, keep a mental log of approximate litres filtered — most manufacturers print a life indicator ring or leave space to write a replacement date, and it’s worth actually using it, because flow degrading gradually is much harder to notice day-to-day than you’d think.

One optimisation trick genuinely worth doing: pre-filter visibly cloudy or silty water through a bandana or spare sock before it goes anywhere near the cartridge. It sounds unnecessary until you’ve watched a £90 GeoPress cartridge clog after three fills from a peaty Highland burn — a 30-second pre-filter step can meaningfully extend cartridge life across every product on this list. And always store a filter bone dry or fully submerged between trips, never damp and sealed in a bag, since that’s the fastest way to grow mould inside a hollow-fibre membrane you can’t see or clean out.

Matching a Filter Bottle to Your Type of Hike

The weekend Lake District day walker. If you’re doing 8-12 mile circular routes with a car or B&B at the end of the day, filtration purity matters less than simplicity — you’re rarely more than a few hours from a tap. A LifeStraw Go Series or Katadyn BeFree covers this comfortably, and the lighter weight matters more than a 600-litre cartridge you’ll never come close to using in a season.

The multi-week Pennine Way or Cape Wrath Trail thru-hiker. Here, running cost and reliability over weeks of daily use trumps everything else, especially across the UK’s long-distance National Trails network where resupply points can be days apart. The Sawyer Squeeze‘s zero-cartridge-cost model, or the Platypus QuickDraw‘s modular threading across bottles and reservoirs, both suit the demands of extended trail time where you can’t just pop to an outdoor shop for a replacement filter.

The budget-conscious DofE student or family group. Cost, durability and a wide margin for user error matter most, especially with less experienced hikers refilling from unfamiliar sources. The Lifesystems Water Filter Purifier Bottle‘s official DofE recommendation and virus-level protection make it a sensible, forgiving choice, even if it isn’t the lightest bottle here.

How to Choose a Filter Bottle for Backpacking

1. Start with the pathogens you actually need to filter out. UK stream water carries bacteria and protozoa risk almost everywhere; viruses are a genuine concern mainly if you’re travelling internationally too, so match your filter tier to where you’ll actually use it.
2. Weigh flow rate against effort. A slow filter isn’t dangerous, but it is annoying enough on a long day that people quietly stop using it properly — pick a flow rate you’ll actually tolerate at hour eight.
3. Work out real running cost, not just sticker price. A £30 bottle needing £12 cartridges every seven weeks can cost more over a season than a £45 bottle with a 600-litre cartridge.
4. Check the weight against your pack strategy. Ultralight thru-hikers should prioritise grams; car-camping-adjacent day walkers have far more slack to work with.
5. Consider cleaning effort honestly. Shake-to-clean membranes suit people who won’t bother with a backflush kit; cartridge systems suit people who’d rather swap a part than maintain one.
6. Match capacity to your refill frequency. A 1-litre bottle refilled often beats a bulkier 2-litre system if water sources are frequent along your route.
7. Factor in compatibility with your existing kit. If you already run a hydration bladder or specific bottle brand, threading compatibility (like the Sawyer or QuickDraw’s 28mm threads) can save you buying an entirely new system.

Filter Bottle vs Standard Water Filter: Which Wins for Backpacking?

A filter bottle for backpacking and a standalone hiking water filter solve the same underlying problem in different ways, and the right answer genuinely depends on how you hike rather than which is objectively “better.” A filter bottle for hiking integrates the cartridge into the vessel you drink from directly — fill, filter, drink, done — while a standard filter like a pump or a standalone Sawyer-style straw treats water into a separate bottle or bladder you carry alongside it.

The written comparison matters more than the table alone: what most buyers overlook is that a filter bottle genuinely struggles once you’re filtering for a group of four or more, because everyone is queuing to fill and drink from one vessel one litre at a time. A gravity-fed standard filter, by contrast, can process several litres unattended while you set up camp, which is why experienced group leaders on Duke of Edinburgh’s expeditions or scout trips often carry both — a shared gravity filter for camp, and individual filter bottles for on-the-move drinking during the walking day itself.

For solo or pair backpacking specifically, though, the filter bottle wins on almost every practical measure: fewer items to carry, fewer steps between thirsty and hydrated, and no risk of contaminating a “clean” bottle by mixing it up with the “dirty” one, a genuinely common mistake with two-bottle pump and gravity systems.

Common Mistakes When Buying a Filter Water Bottle for Hiking

The single biggest mistake is buying purely on filtration percentage without checking what pathogen category it actually covers — a bottle boasting “99.9999% effective” sounds reassuring until you notice it’s only tested against bacteria and protozoa, not viruses, which matters enormously if your trips ever leave UK water sources. Read the small print on exactly what’s removed, not just the headline percentage.

A close second is underestimating replacement cartridge cost over a season. Reviewers consistently flag this after the fact rather than before buying — a bottle that looks like the cheapest option in the shop can end up the most expensive once you’ve bought three or four replacement cartridges across a summer of regular use. Work out an estimated annual cost before comparing sticker prices.

Buyers also frequently ignore flow rate until they’re standing at a stream on a cold, tired evening wishing their filter moved faster. And a genuinely common practical error: storing a damp filter sealed in a dry bag between trips, which invites mould growth inside a membrane you can’t inspect or clean properly — always dry it fully, or store it wet and used, never damp and enclosed.

Refilling From Streams: Building a Trail Hydration Strategy for UK National Trails

Refilling from streams is one of the most useful skills a backpacker can develop, and it’s also one of the most commonly overdone in caution or underdone in carelessness. Britain’s National Trails cross genuinely remote, high-quality upland catchments in places like the Pennine Way and Offa’s Dyke Path, where water is generally cleaner than lowland rivers — but “generally cleaner” is not the same as “safe untreated,” and livestock grazing near almost any UK water source means bacterial and protozoal contamination is a real, ever-present possibility rather than a rare edge case.

A sensible trail hydration strategy starts with source selection before it ever reaches your filter: moving water over rock rather than stagnant pools, upstream of any visible livestock or farmland where the route allows it, and avoiding water sitting directly downstream of a footpath crossing or gate where animals congregate. None of that replaces filtration, but it does reduce the load your cartridge has to deal with and extends its working life.

The health stakes are real rather than theoretical. Waterborne parasites including Cryptosporidium in untreated water can survive standard low-dose disinfection and cause several days of unpleasant gastrointestinal illness. Filtering every fill without exception, regardless of how clear the water looks, is the only sensible baseline — clarity tells you almost nothing about microbiological safety.

Safety, Regulations and Water Quality Standards on Wild Water

There’s no UK-specific legal requirement to filter water drawn from streams while hiking, but there is a well-documented public health case for doing it anyway every single time, not just when water looks obviously questionable. UK Health Security Agency surveillance data on giardiasis and cryptosporidiosis risk shows these infections are neither rare nor evenly distributed across the country, with clear regional and seasonal variation. Look for filters independently tested against recognised standards — NSF 42, NSF 53, or the US EPA’s P231 protocol are the ones referenced most consistently across the products in this guide, and they indicate third-party verification rather than just a manufacturer’s own marketing claim.

It’s worth being precise about what “filter” versus “purifier” actually means in regulatory terms, because the words get used loosely. A filter, in the strict sense, is rated to remove bacteria and protozoa — organisms large enough to be physically caught by a fine membrane. A purifier goes further, meeting standards for virus removal too, since viruses are small enough to slip through a standard hollow-fibre membrane’s pores. Of the seven bottles in this guide, the GeoPress, Water-to-Go Active and Lifesystems bottle all meet purifier-level standards; the others are filters in the strict sense, entirely adequate for UK conditions but not formally rated for international travel to regions with viral waterborne disease risk.

Buyer’s Decision Framework

If you’re mostly doing UK day hikes and weekend trips, choose a lightweight filter-tier bottle like the Katadyn BeFree or LifeStraw Go, because virus protection is largely unnecessary and weight matters more than cartridge lifespan you’ll rarely exhaust.

If you’re planning a multi-week UK thru-hike or extended trail time, choose a bottle with effectively unlimited or very long-lived filtration like the Sawyer Squeeze or Platypus QuickDraw, because running cost and reliability over weeks beat any other single factor.

If your trips genuinely leave the UK for regions with less reliable water infrastructure, choose a purifier-rated bottle like the GRAYL GeoPress or Water-to-Go Active, because virus protection stops being optional once tap water itself can’t be trusted.

If you’re kitting out a younger or less experienced hiker, choose a forgiving, officially recommended option like the Lifesystems Water Filter Purifier Bottle, because its DofE endorsement reflects real-world durability under exactly that kind of use.

FAQ

Conclusion

Choosing a filter bottle for backpacking really comes down to matching filtration tier, weight and running cost to the trips you actually take, not the ones you might take someday. For most UK hiking, a bacteria-and-protozoa filter like the Katadyn BeFree or LifeStraw Go Series is genuinely all you need, and it’ll be lighter and cheaper to run than a full purifier you’ll rarely push to its limits. Step up to purifier-rated options like the GRAYL GeoPress, Water-to-Go Active or Lifesystems Water Filter Purifier Bottle the moment international travel or group expedition use enters the picture, and consider the Sawyer Squeeze or Platypus QuickDraw if long-term running cost across weeks of thru-hiking matters more to you than upfront price.

Whichever you choose, the habit matters more than the hardware: filter every fill, pick your source with a bit of care, and maintain the cartridge properly, and any of the seven bottles above will keep you drinking safely from Britain’s streams — and further afield — for seasons to come.

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