for simply space living .... "Tanks of H20 can't be constantly shipped up to the International Space Station, so the station has a complex water system that squeezes every last drop of available, drinkable liquid out of the environment. That leaves astronauts drinking a filtered mixture that includes recycled shower water, old astronaut sweat, and pee. The station also keeps about 530 gallons of water in reserve in case of an emergency. The NASA water systems on the ISS collect moisture from breath and sweat, urine from people and research animals, and runoff from sinks and showers to keep the station hydrated. “It tastes like bottled water, as long as you can psychologically get past the point that it’s recycled urine and condensate that comes out of the air," http://mentalfloss.com/article/67854/how-do-astronauts-get-drinking-water-iss