We always carry a few of the 7 gallon water jugs and then I cheat. I use an electric water pump from home depot and my generator to refill the fresh water. It is designed to pump water out of a flooded basement area, so it will empty a 7 gallon jug in short order.
2007 Jayco Jay Flight 26BHS
2005 GMC YukonXL Denali
4 6-volt batteries - 440 AH bank
Magnum Energy MSH-3012 Tri Metric 2025
Yamaha EF3000iSEB generator
Winegard Traveler DirecTV slimline HD SK-3005