Water still seems to be the bigger issue so far.   We rarely use the generator except for coffee in the morning and briefly at night.  However,  we feel that conserving water is going to be harder than conserving generator gas and propane. We had the thought of using the campground showers but because of a late dinner (that’s another whole story) we took boat baths.   Boat baths are our name for sponge baths. 
Since we did not think of water as being a major we will continue to ponder this situation and perhaps come up with better solutions for our summer trip