Recruiting other players through a social action can result in a reward of some Darkdrop Coffee. It has also been awarded to players in the past (very rarely) to make up for service outages.
As an on-use item
Consume Darkdrop Coffee
Musky! Explosive! Almost certainly not actually brewed from bat guano! That's just Mr Wines' little joke.
Drink the coffee
Coffee is pleasure in pain. This stuff is best drunk when the candles are guttering and you need a little fire in your belly. Grind it fine, and add only a little water. [Drinking Darkdrop Coffee costs one action but restores ten.]