You are located in the south, where the air is very humid. The humid air is getting into the refrig, and the humidity condenses out as liquid water. There are two ways that all that humid air can get into the refrig. First, perhaps you open the door to the refrig quite often (did you say 4 girls?). Or second, the seal around the door does not seal properly. To check this, run the dollar bill test. Open the door, and at several places around the door, lay a dollar bill half in / half out of the refrig, and close the door on the dollar bill. Now, with the door closed, try to pull the bill out. You should be able to pull it out, but there will be substantial resistance if the door is sealing correctly. If it slides out easily, the seal is shot, and it is likely that air is leaking in past it.
Bill
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