So the savvy preparer makes room in his secret bunker for a good supply. It is most efficient to hold the instant version. Of course, the effete SHTF survivalist might want keep grounds on hand for personal use, reserving the powder for barter. Two ounces of Folgers "crystals" for a pound of Unique. Take it or leave it, Bub.
Don't say I didn't warn you.
(Next survival exegesis: whiskey.)