Live Well Question Also

Just read the post on round live well. I have an 84 V-20 Cuddy with a rectangular well in the center just aft of the Captain Seats. I have been using it as additional storage for lines, anchors, etc. There is a pump in the bottom beside the drain hole. Do any of you guys have the same setup, and if so, how do you use it as a live well... where is the water source, or do you simply fill it with water by bucket and use the pump to change it? Any info would be a help.

Thanks,
Ken Clelland
aka: Lead Head