One of the biggest dangers to you come the post-apocalypse will be your own body and its needs. You are not a computer game character, or a movie character, able to go days, maybe weeks with only a morsel of food and an hour of sleep on a filthy mattress. You need more than that. And exhaustion may be your killer.
There’s a saying ‘To Assume makes an Ass out of U and Me’. I hate that saying, because it’s stupid and because it uses the American ‘ass’ and as far as I’m concerned that’s a donkey. I think that the saying should be ‘Assumptions will mean you starve to death or die of cholera’ but admittedly that’s not very catchy. However, it is much more accurate. Making assumptions probably won’t turn you into a donkey,