My "gold standard" - green beans recommended for dark roast from Sweet Maria's, roast the beans dark in a modified air popcorn popper, let outgas for 24 to 48 hours after roast, Mini Mazzer burr grinder, Elektra Microcasa a Leva lever action espresso machine. Dilute with hot water for "cafe Americano". Great coffee, but not practical for camping.
For camping, I've tried a small drip machine (leave top open and use like a Melita when without hookups), a French Press, a MyJo K-cup machine, and an Aerobie AeroPress. My goals - ease of use both with and without electric hookups, ease of cleanup (no need to rinse grounds out - minimize grounds down the drain), easy availability of supplies, and best coffee. Conclusions:
Drip Machine (used as a Melita without electric) - easy to use both with and without electric, easy cleanup, uses regular coffee and easily available filters, coffee "just okay".
French Press - easy brewing both with and without electric, cleanup is an issue - either dump grounds with rinse water into a bush or a jug to avoid grounds in the drain, uses regular coffee, best coffee of the four tested.
MyJo "K" cup - easy brewing both with and without electric, easy cleanup if using K-cups, can use regular ground coffee but cleanup becomes similar to French Press - therefore "requires" special K-cups, coffee is better than drip but not as good as French Press or AeroPress.
AeroPress - easy brewing both with and without electric, cleanup almost as easy as K-cup (slug of grounds pops out into trash, but leaves a layer of grounds on the press - found I can easily scrape that layer off into the garbage with the edge of the supplied stirrer), uses regular ground coffee, requires special filters from Aerobie, coffee is almost as good as French Press.
Without electric I heat the water in a small pot on the stove; with electric in the microwave.
For us, the Aerobie AeroPress is the "winner". Depends, of course, on your personal weighting of the factors important to you. Best coffee - I vote French Press. Easiest cleanup - I vote MyJo (home type Keurig uses too much electric for no hookups).
2012 Solera "S"
Calif SF Bay Area