Question: How much water do astronauts need to drink in Space? Is it less than on Earth?

James Harpur answered on 17 Mar 2017:

I’d imagine the astronauts are kept at a good hydration level as they are very busy all day and then have to fit in exercise as well each day in order to combat the negative effects of being in zero-f.

I don’t know is the answer but I would imagine for their health, they would need a normal supply.