Max Brooks

Any survival guide will tell you, don't buy a pair of combat boots before any disaster. They'll tear your feet up. Or water - don't bring water with you because it'll tire you out and you'll lose too much fluid. Bring a water pump.

At one point, I didn't get out of bed for, I think, three months, and I went down to the bottom of the hill one day and I had to call somebody to get me to come back up - come pick me up because I couldn't physically walk up the hill.