Deep well
A well of fresh water sunk far into the ground — a private source reached by a long drop.
A deep well in a dream is the dream's image of a private source reached only by a long drop. The water is real and good; the access is not casual. The dream brings the well when something in your life — a long-held faith, a love kept for many years, a deep competence — has a real supply at the bottom and requires a deliberate descent each time you go to draw. A well drawn from cleanly is the dream affirming the kept access. A well with the rope rotted, the bucket gone, the depth still full but no longer reachable, is the dream noting that the source is intact and the means of getting to it has been neglected, and the supply might as well not be there.