Let's talk about the thing that turns "camping out of a van" into actual van life: running water. A solid campervan water system is what lets you wash dishes, rinse sandy feet, brush your teeth, and take a hot shower without hunting down a gas station bathroom. It sounds intimidating if you've never touched a plumbing fitting in your life (relatable), but the good news is a basic van water setup is genuinely one of the more beginner-friendly systems in your build.
Here's the no-nonsense breakdown of how to plan yours.
Start With How You'll Actually Use Water
Before you buy a single tank, think about your real-life habits. Weekend warrior who mostly needs water for coffee and dishes? You can get away with a small, simple setup. Full-time nomad who wants an actual shower without visiting a truck stop every three days? You'll want more capacity and probably a pump-fed shower.
Most builds land somewhere in the middle with a 15–25 gallon fresh water tank, which is enough for several days of drinking, cooking, and light washing for one or two people. Bigger rigs (or families) sometimes go up to 40+ gallons, but remember: water is heavy. A gallon weighs about 8.3 lbs, so a 25-gallon tank adds roughly 200 lbs to your van once it's full. Factor that into your weight budget right along with your batteries and cabinetry.
The Three Water Types You're Dealing With
Every campervan water system has three "flavors" of water flowing through it, and keeping them straight makes the whole thing click:
Fresh water is your clean, potable water — what fills your tank at the spigot and comes out your faucet or shower head.
Grey water is the used water that drains out after you wash dishes or rinse off. It's not sewage, but it's not clean either, and most places require you to dump it responsibly (not just onto the ground).
Hot water isn't technically a separate tank, but it deserves its own mention because it's the upgrade most van lifers wish they'd planned for from day one.
Picking a Pump (and Why It Matters More Than You'd Think)
Gravity-fed systems exist and they're dead simple — no pump, no wiring, just gravity pulling water down to your faucet. But most people opt for a 12V water pump, which gives you actual water pressure so your faucet doesn't dribble like a sad garden hose. A decent 12V pump runs somewhere in the $30–$60 range and draws power from your house battery system, so make sure it's on your electrical load list when you're sizing your solar and battery bank.
Look for a pump with a built-in pressure switch (it turns on automatically when you open the tap and shuts off when you close it) — it's a small feature that makes daily life so much easier.
Don't Skip the Grey Water Plan
This is the part new builders forget until they're standing in a parking lot with a bucket of dirty dish water and nowhere to put it. You've got a few options:
A dedicated grey water tank (usually smaller than your fresh tank, in the 10–15 gallon range) is the cleanest solution — you fill it as you use water, then dump it at an approved dump station or RV facility. A portable grey water jug works too if you're tight on space or budget; you just have to remember to empty it more often. Either way, plan your drain routing early so it doesn't become an awkward afterthought wedged under your sink.
Hot Water: Worth the Upgrade?
Short answer: if you're living in your van full-time or spend a lot of time in cold climates, yes. There are a few common routes: an inline propane or diesel water heater (fast, reliable, but adds a fuel source to manage), an electric mini water heater powered off your battery bank (clean and simple, but power-hungry), or a solar shower bag that you heat passively in the sun (cheap and low-tech, but weather-dependent).
A lot of builds these days pair a compact on-demand water heater with an outdoor shower port on the side or back of the van — it keeps the sand and soap outside where it belongs, and it's one of those features that makes a build feel genuinely livable instead of just "camping in a metal box."
Budgeting It Out
Here's roughly what you're looking at for a solid mid-range setup: fresh water tank ($50–$150 depending on size and material), 12V pump ($30–$60), grey water tank or jug ($40–$100), fittings, hose, and a faucet ($50–$100), and a water heater if you're adding one ($150–$400+). All told, a complete basic-to-mid system typically lands in the $150–$350 range without a water heater, or $300–$750+ with one. Not bad for the difference between "roughing it" and "actually comfortable."
A Few Install Tips From the Field
Use food-grade tubing and fittings only — regular hardware store PEX isn't rated for potable water and can leach stuff you don't want in your coffee. Insulate any exposed lines if you're building for cold weather or four-season van life; a frozen pump or split line is a miserable surprise. And always add an easy-access panel or removable cover near your tanks and pump — you will need to service or winterize this system eventually, and future-you will be grateful you didn't build it into an unreachable corner.
Wrapping It Up
A campervan water system doesn't need to be complicated to be effective — it just needs to be planned around how you'll actually live on the road. Start with your real usage habits, size your tanks accordingly, don't cheap out on your pump, and give grey water a real plan instead of an afterthought.
If you'd rather skip the trial-and-error and have a system that's actually integrated with your electrical, insulation, and storage layout from day one, that's exactly the kind of thing we sort out for folks at AdventureBumss. Check out our van builds or get in touch and we'll help you figure out what water setup actually fits your rig and your travel style.
Safe travels, and may your tank always be full when you need it most. 🚐💧
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