I have found the large 4-cup moka pot to be very efficient for camping coffee, particularly if you also have a kettle on the griddle with hot/near-boilng water for refills. Or in the campfire. I use an aluminum calphalon non-whistle teapot for that.

With a good single-burner (butane/propane or white gas) it becomes reasonable to crank out good coffee for 2-3 people at a time (1.5 to 2 cup) on a ~6 minute cycle.

Uhh maybe my use case is atypical, but still. Moka-pot is good for camping cuz it's fast, easy-clean and can produce great results.