I like espressos (especially mochas) but they take a bit of work to prepare a single cup. With drip brew, I can do very little and get unhealthy amounts of caffeination into my corpse. Also, I pour ungodly amounts of creamer into my coffee. That Mason jar is quite literally half coffee half creamer.
I’ve got one like that, but in the military. We got little packets of instant coffee in our rations, I’d just pour that in my mouth and drink some water. I think that’s still technically coffee. Tasted like shit but woke you up, first from the taste and then from the caffeine. Mission accomplished, that’s a good coffee in my book.
Getting down those concentrated bitter coffee crystals with semi cool water (that might be a bit mildewey or plasticky depending on the age of the camelbak you’re drinking from) on a long shitty ruck just feels proper.