A gallon or two in a jug for water. Not planning on a generator at this time, all the lights in the camper are LED so they don't use up a lot of power, I also have a 12V power supply and 110V for use when I camping where there is hook ups. A generator would be nice for the AC but I can live without it for the time being. Think of it as a really sturdy tent, a really expensive and labor intensive tent. It's an upgrade!
Rob
