A five-gallon collapsible jug with a spigot. Full, it sits on a tailgate or table and runs water on demand. Empty, it folds down and takes almost no room in the truck.

Five gallons is the number that matters for a weekend. It covers drinking water, dishes, and enough left over to wash your hands before you eat — without a run back to town.

The spigot is the whole point. A rigid jerry can means lifting forty pounds every time somebody wants a cup of coffee. A container with a tap means you set it down once and leave it.

Carry two if you are camping dry. Water is the one supply nobody rations well.