Many STAR TREK Bridges, No Bathrooms
According to these detailed drawings of every Starfleet bridge ever, only Jean Luc Picard had to pee. Old bastard.
Ex Astris Scientia, “Bernd Schneider’s Star Trek Site,” has a remarkable series of cutaway illustrations of what might be every single Federation starship bridge seen in the Star Trek franchise (except for JJ Abrams’ version). It’s exhaustive, and after looking through many of the drawings I have come to the conclusion that the people of Starfleet just don’t pee. There are almost no restrooms - except for Enterprise NCC-1701-D. That one has a toilet.