Here is a portable shower with the pressure of a garden hose without a fancy pumping system. The RinseKit traps pressure from the water from your home for later use. It can spray for up to 5 minutes. RinseKit is lightweight and easy to carry around. With the Heater accessory, you will be able to heat water outdoors.
The heating system has a battery that can be charged in your car. The insulated tank holds heat for hours. Like what you see? You can find this project on Indiegogo.