Personally, I just took a book in with me. (I thought everyone did, but apparently not.)
Many share houses, when I was a student, put the film calendar for the local art house cinema on the back of the toilet door. It was the accepted place for it.
Reading on the pot is a time-honoured tradition.
My grammy had a curated bathroom library. Usually those "1000 Odd Facts" type of books that you could pickup and flip through.
The Sid Meier's Alpha Centauri manual was a personal favorite of mine.