Since a malfuntioning GFCI recept, will either falsely trip or not trip at all, I don't see any drawback to place a GFCI on the water cooler circuit as opposed to a standard duplex.
If it falsely trips, then someone will attend to the faulty GFCI. If it doesn't trip due to failure, then it is just as good as a standard duplex.
I agree with txsparky, that they probably will never be tested, but is that a reason not to install a gfci?
