I remember a large survey across the French prisons, about 10 years ago. The number one wish of prisoners was to be granted more showers during summer. Context: overcrowded prisons (prisons for light sentences have 142% rate, so 2 or 3 people in 9 m² are common), old buildings, very little time out of cells, 3 showers per week in the law but often 1/week in reality.

And getting into fights? Constantly sussing out everyone else's intentions? Not being able to trust anyone?

I don't have a lot of first hand experience, but fights don't happen as much as TV would have you believe.

I don't have much either, but basing it on behind the scenes TV shows based on jails. (I guess different to prisons - more comings and goings). Obviously TV will show you every fight, and maybe they don't happen often, but I bet there is a lot of posturing leading up to those fights. I remember what high school was like, probably not much different.

Your high school must have been tougher than mine

Playing dungeons and dragons all day to pass the time?