Why not try and get off caffeine? Blasphemy to americans I know; but it would be better not to be craving it in a survival situation.
For one thing it spoils your aim if you are shooting (your hand shakes slightly).
I was always amused by the people recounting spending fortunes on guns and gear with a coffee in their hands.

By the way is it true disgruntled american employees volunteer to make the office coffee; then alternate monthly between decaff and espresso? :-)
qjs