http://www.amazon.com/gp/aw/d/B003EEESP ... PKS767GHWN I use this shower from zodi. It came in a bag, I replaced the bag with a five gallon bucket with a gama seal lid. We drop the shower head into the bucket and heat the water to the temp we want, then shut the gas off and take a shower. One bucket full is good for two plus showers.
I like having the heater built in, heating water on the stove, then dumping it into a tank is a pain, and hard to set the temperature.
Solar heat is worthless early in the morning, or after dark.