Water is the one resource that turns a comfortable trip into a short one when you run low. Unlike food, you can’t ration your way around a real shortage, and unlike fuel, you can’t always buy more where you’re headed. This guide walks through how much to carry, how to store it without wasting space or blowing your payload, and how to safely refill from natural sources when your supply runs down — plus the Leave No Trace rules that keep water sources clean for everyone.
Step 1: Calculate how much you need
Plan for one to one and a half gallons of water per person per day. That covers drinking, cooking, and basic cleanup. Then add a buffer.
- Carry one to two extra days of water beyond your planned trip length. Delays, breakdowns, and missed resupplies happen, and water is the worst thing to be short on.
- Account for heat and exertion. Hot weather and hard miles push consumption up. Round generously.
- Don’t forget the dog. Pets drink too, and it adds up.
For a two-person, three-day trip, that’s roughly 6 to 9 gallons plus a buffer — call it 10 to 12 gallons. Which leads straight to the next problem.
Step 2: Check your payload before you fill up
Water is heavy — about 8.3 pounds per gallon. Ten gallons is over 80 pounds, and a full week’s supply for a couple can quickly eat into your rig’s payload capacity. Before you load up:
- Know your vehicle’s payload limit.
- Weigh water against everything else you carry.
- If you’re over, that’s exactly why filtration matters — it lets you carry less and refill along the way.
Step 3: Choose your storage
Match the container to the trip.
- Portable jugs and containers. Simple, durable plastic containers are the beginner default — easy to fill, easy to pour, easy to replace. See best water storage containers for specific picks.
- Collapsible containers. These pack flat when empty, which saves space on the drive home or when you’re carrying spares for emergencies.
- Fixed tanks. Dedicated rigs can plumb in a built-in tank for larger storage and on-board taps. More capacity, more weight, more commitment.
Keep at least one clean bucket or expanding jug for hauling water from a source to a wash site away from camp.
Step 4: Have a way to make water safe
For longer or remote trips, a guaranteed clean supply isn’t a given. Carry a way to treat water:
- Portable water filters remove bacteria and protozoa and let you draw from streams and lakes. The fastest, most reusable option for most trips. See best portable water filters.
- Chemical purification tablets are light, cheap, and a smart backup. Slower, and they leave a taste, but they pack into any kit.
- Boiling works in a pinch if you have fuel to spare.
Carrying a filter or tablets is part of the standard ten-essentials kit for a reason — it turns every stream into a potential resupply and lets you carry less water from the start.
Step 5: Protect the water source (Leave No Trace)
How you use water in the backcountry matters as much as how you carry it.
- Wash 200 feet from water. Whether it’s dishes or yourself, move at least 200 feet — about 70 adult steps — from any lake, stream, or spring before using soap.
- Use biodegradable soap, sparingly. Even “eco” soap belongs away from the water, not in it.
- Strain and scatter greywater. Filter food bits out with a fine mesh strainer or bandana, pack the solids out with your trash, and broadcast the water widely well away from camp and any source.
- Pack out all food waste. Crumbs and organic scraps like orange peels draw wildlife and pollute — they go home with you.
Common mistakes
- Underestimating consumption. People plan for drinking and forget cooking and cleanup. Use the full per-person figure.
- No buffer. Running exactly to plan leaves zero margin for delays.
- Skipping treatment on “short” trips. Plans change; a filter weighs almost nothing.
- Washing in the water. The single most common Leave No Trace violation at camp.
Takeaways
Plan a gallon-plus per person per day, add a day or two of buffer, and check that the weight fits your payload. Store it in durable jugs (collapsible ones for spares), carry a filter or tablets so you can refill from natural sources, and keep all washing and greywater at least 200 feet from any water. Get that right and water stops being the thing that ends your trip early.
For how water fits the rest of the kitchen, start at the camp kitchen hub.