As an aside, and I don't drink coffee so I can't vouch for this either --

There used to be two types of coffee in the MREs, type I and type II. Those that had to have their coffee daily swore that Type II had more kick. These were the guys who would "dip" it like snuff. They'd also make sludge, barely enough water to make it drinkable, add a load of sugar and creamers and pound it down. (Gahhhh if you ask me)

So if you absolutely have to have coffee, see if you can find the TypeII packets.

Personally, I take my caffiene cold or in tea, also preferably iced.