Water/ice pools in bottom of freezer
The real problem is that the drain which carries the defrost water away from the coils (and down to the external pan underneath where it should evaporate) has become plugged with ice (from having left the door open thereby icing up the coils and the drain). The problem you have now is that the normal defrost cycle was not designed to melt the ice plug that is blocking the drain.
Solution: You have to either (1) if you're handy, you can remove the plastic panel over the coils in the back of the freezer and melt it out with a hair dryer or hot water -- or (2) unplug the unit, leave the doors open and let it melt out by itself. I don't know how long you'd have to wait for (2) to completely melt the ice plug -- I'm guessing at least 24-36 hours to be sure.
I did (1) and it took me about 2 hours to remove the freezer bin and door, remove the main drawer slides, remove the internal drawers and their slides, remove the back inside panel, find the ice plug (lower left side of the drip tray under the evap coils), melt it out with hot water from a baster, verify that the drain was clear, reassemble in reverse order. But it worked. Problem completely solved -- no water since. By the way the drip tray was completely full of ice - right after a defrost cycle had completed -- so this problem will never resolve itself without intervention.
Bear in mind, the whole cycle COULD happen again if the drawer is left open again and the excess ice builds up on the coils again. This is a design flaw in the unit itself. However, I read about a clever solution to prevent a new ice plug forming as a result of the open door. Just loop a length of 10-12 gauge bare copper wire around the defrost heater element and insert the other end of the wire in the drain hole. Heat conducted through the wire during defrost will clear any ice plug that may form.
on Aug 06, 2014