Scott Townsend wrote:

there is still about 3 gallons of water in the bottle. Any tricks
for getting the bottle off without making a mess?

Hmm.

1. Duct tape the bottle to the dispenser. Turn the whole thing upside down.
Remove duct tape. Remove dispenser.

This probably won't work in that there's water in the internal resevior.

2. Get a moving dolly. Cart the whole enchalada into the parking lot and
disassemble there.

3. These "bottles" are plastic, right? Drill a teeny hole in the plastic, as
low as you can get, and catch the water stream in a bucket.