Drinking coffee in a dream is the image of intake: taking in energy, warmth, or — in the oldest readings — wisdom. What the coffee tastes like, and who is across the table, does most of the interpreting.
Sweet, bitter, and too hot
Sweet coffee reads as pleasure arriving easily and a period of deserved enjoyment. Bitter coffee means the energy or truth you are taking in is unbuffered — real, useful, not yet sweetened; dream work reads it as growth with its work clothes on. Coffee too hot to drink comfortably suggests impatience: the good thing is ready before you are.
Alone or together
Coffee drunk alone in a dream is the psyche granting itself a pause — often appearing during overwork. Coffee drunk with another is conversation energy: something is ready to be said. In Turkish dream tradition, sharing a cup with an elder means counsel is available to you, awake, from someone experienced.
The grounds at the bottom
A dream of finishing the cup points, with the tradition's usual economy, at what remains when the drinking ends. Let the real cup answer: read your grounds.