Where do astronauts get drinking water from

Astronauts drink water that comes from the ambient cabin's humidity, which is eventually condensed and returned to the water supply. The water is filtered from recycled shower water, astronaut sweat and urine.

Nearly all of the water astronauts drink and shower with comes from their urine and sweat. Storage is hard to come by aboard the International Space Station. Even if a rocket had room to ferry thousands of pounds of water and oxygen to supply a six-month mission, you'd struggle to find anywhere to stash it.