Thanks for your ideas! There's a good way of combining them and make it work. Set a big tub of water, one of those red or blue ones from the hardware store, in the sun to semi-warm up. Take a dip in the pool to get wet. Use the warmish water to soap up, wash hair, rinse. Get back in the pool to wash off the remainder of the soaps.

Yeah, solar panels. How I wish! But there just is no good place to put them with our setup. I have most of my refrigerator stuff in the camper fridge which runs on propane. It has a shower but dang it, the water tanks are empty and I have no way of filling them.