Wow, stuck for several decades? I'll be so old by then someone might have to bring me my marbles, lol, remember the story of Peter Pan?
#1 I would have to have something to read.
A tome
of poetry, maybe Keats, or Shakespere's entire works, (that include poems).
#2 Next, I would have to have music but with no electricity or items available to make a battery I think I would have to make do with a musical instrument like
a guitar.
#3 Lastly, some sort of game would be nice since cards, drawing tic-tac-toe, checkers, chess and hang-man in the sand would get old in a hurry. It's also not any fun to play these by yourself.
a huge trunk of clothes
with everything in my size, of course and from the 18th-21st centuries.