I only brought clothes and a knife. You find out really quickly what you personal addictions are that way.
Reminds me my time in the army. I used to live off snakes and mushrooms at one point. Really takes our mind away from everything (even army stuff).
The The World of Null-A by A. E. van Vogt, an old SF-novel, says some interesting things about that.
another one added on my reading list
Strangely, the "quotes" under the chapter headings in the edition I have tell more about Null-A thinking than the novel itself, if I remember correctly. A quick scan of those is fun.
will definitely check them out