Overview
Water storage is a system, even when it is just a can.
Five gallons is enough water to matter without becoming ridiculous to move. That is why this size keeps showing up in practical vehicle-camp setups.
A durable can is easier to secure, easier to label, and less likely to split, leak, or collapse at the worst possible moment than a flimsy grocery-store jug.
The trick is keeping drinking water gear clean and separate from fuel, gray water, and random camp grime.
Good water storage disappears into the routine. Bad water storage leaks into everything.