The only caffein(can't spell) I drink is ice tea, and cappucciono's in the winter >.< no coffee for me :) ..Be sides I can just wing it sit with my gun in my arms and hope the other person thinks I'm ready for combat, and they run away in fear :D hahaha, anybody try that trick?

Biggest advice i can give you
Water-lots of it
Some type of nuts- although most people say salted is bad, you lose alot of minerals in sweat and such, the extra salt helps even if it does make you a little more thirsty, almonds are my greatest recommendation.
A blanket of some sort- Ranger blankets may not be designed for comfort, but they are dam handy and do keep in alot of warmth while shedding water.
Light sorce.