One thing few writers focus on, in terms of the post-apocalypse, is dental care. A cavity can literally kill you if it progresses far enough. David Brin actually addressed this in The Postman; maybe this is why everyone in post-apocalyptic television and most films has shiny white teeth - they know!

Whenever I read or hear about "preppers" or people preparing for a catastrophe, I've always wondered what their plan was for dental care. When I was in my early 20's, my wisdom teeth became impacted. My only symptom was a horrible upper respiratory infection that turned into pneumonia. Without antibiotics and then surgery to remove the teeth, I probably would have died.

And The Postman was a wonderful book.