Gas camp stove, pan, Mason Jar, metal funnel and a coffee filter. Makes as good as a Kerig machine.
I like your suggestion! I’ve been known to boil water on the grill and pour it through a coffee maker basket lined with a filter & coffee grounds into the carafe. Leave the basket ‘open’ with the carafe below. Not the same as the Keurig, but definitely desirable when the power is out.