I think this would be so much better and useful if it was a solar powered shower that sat in your garden. It could catch rain water when available and use tap water (from the hose) otherwise. It's pretty simple to stick a water tank in a solar oven to heat the water too. And you don't need a water pump if the water tank is on the roof, you get plenty of water pressure from gravity.<p>The water could also then drain into the garden if you used the right soaps in the shower.<p>A nice design like this could really bring grey water to people who don't want to build their own outdoor showers.