Well, you're not getting enough water.
4 seconds sound clip from the Apollo 13 movie soundboard.
You can hear this line at 01:24:38 in the Blu-ray version of the movie.
Quote context
[...]
- You're gonna find out soon enough.
- Sure.
- I never dreamed I'd ever get to do something like this. Come up here on a real mission.
- Most of the guys I graduated high school with never even left home, and here I am.
- Well, you're not getting enough water.
- I'm drinking my ration the same as you.
- I think old Swigert gave me the clap. He's been pissing in my relief tube.
- Well, that will be a hot one at the debriefing for the flight surgeon.
- That's another first for America's space program.
[...]