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yeah, it's not the actual water inside it, but the dispenser and the bottle that's holding the water. One of the guys here have worked at a bottling factory and he said he wouldn't trust the spout to be clean, as that's where people grab them to handle them.
And the dispenser has a hot water option, which I'm assuming is some supercharged heater thing that instantly heats it up, but whenever you get heat and moisture, well, things start to grow...
I took apart the very top part of the dispenser once, and had to wipe it down because it looked like the water was just sitting there for no reason. I was commenting on it never being cleaned, and I guess the person who's in charge of it heard me as a technician showed up the next week to clean it.
I would much rather prefer tap, but we don't have a sink nearby!