In which it has been a month (aka, A simple guide to surviving a disaster)

Sometimes you're unlucky. If you believe in an afterlife that requires preparation, factor that into your planning. If you particularly want to make it easy on recovery workers and your friends and family who have to wait for you to be identified, you could try wearing something with your name on it that's resistant to fire/water/crushing/etc.

If you're not unlucky:

The first minute
You want: A torch (if it's dark and you rely on sight) or at a pinch a cellphone or other light-shining technology.

Know your escape routes.

Note the plural. The ideal route will depend on the disaster. Some disasters require getting low; others require seeking high ground. Some require getting outside immediately; others require a modicum of delay; others yet require staying inside and sealing all cracks.

If you've escaped: congratulations, you've survived the disaster!

( All the rest is making yourself comfortable )