In space, you have to drink your urine to survive
Water is the source of all life on Earth. However, it is a very dense substance, and it is hard to transport in large quantities into outer space. That is why, when they built the International Space Station, they designed it to be self-sufficient and recycle as much water as possible from waste such as sweat, exhalations, and urine.
Yes, astronauts end up drinking their own pee. However, that liquid waste goes through many different processes to make sure that it is safe to drink. We doubt it tastes the same as fresh spring water, but it is probably worth it to spend six months in space.