thank you guys just curious does anybody or has anybody thought about doing some sort of more or less built in system
Paul @ equipt has some nice tanks that would fit behind the seat of a cherokee, or wrangler. Both designs hold about 13 gallons. They are quite a bit smaller than one would think, and are supposedly made of thick food-grade plastic.
I think they both have feed tubes/valves, as well as capped fill holes that are easily accessible.
These could easily be integrated into a kitchen/drawer system in the back...
What's great, too, is that the weight of the water which is substantial @ around 8lbs a gallon, is lower than the doorsills. This would keep and may even lower the vehicles center of gravity, making side-hills more stable.