Tokyo-based startup Hotaru has created a water-recycling portable shower that works by using multiple water reservoirs to store and purify water. The inventors of the shower claim their product can recover over 95 percent of the water used in the shower and that a family of three can each take a daily five-minute shower using the same 20 liters of water for up to two weeks.
The compact shower can be easily deployed in any area and is outfitted with various sensors and alerts to maintain the level of purification. It does require a power source; you can hook it up to a car for basic power to run it, but to power the water heater you would need a generator or AC connection. The product, with an estimated price of $3,000, will initially be available in Japan by 2017.