[X-Posted from Reddit - /u/Jenozie] - Looking for (post) apocalypse survival stories

Im looking for stories about life during or after the collapse of society. As far as realism goes, I can live with most things as long as its not so absurd that it makes no sense (for example the sun vanishes one day). Ive read a few of these sort of stories in my teenage years but I dont recall any particular ones. So have at it and suggest anything from the classics to the hidden gems of the genre.