It's not the natural disasters, it's the asses and idiots that crawl out of the rocks afterward. I've thought about the guns and ammo thing but what happens if you run out? Use the gun as a club? To me a bow and arrow makes more sense. Shoot his ass, pull the arrow out and reuse it. Endless supply of weaponry. Of course, if you're mobbed a good small arms barrage works wonders on evening the odds.