1 Canteen Cup (16oz) Mess-Hall Regular Coffee (or over-brewed civilian)
Coffee, Cream and Sugar Packets from an MRE (Was C-Ration, back in the day)
Cocoa Packet from the ration in question
Caffeine Pills (No Doz or Vivarin) to taste
Stir coffee, cream, and sugar packets into the existing coffee. Add cocoa packet, and beat out the lumps. Calibrate Caffeine pill dosage by days in field, hours since last sleep, and fire missions / hour. Stir pills until dissolved.
Consume as needed, until back in Garrison.