Drinking water?

Once in the food court we watched the locals procure their beverages. There was no soda fountain, only a case of glasses with a hot and cold water spigot next to it. It appeared that you grabbed a glass out of the ultraviolet lighted case and filled it at the spigot... seemed easy enough! Matt wandered over and filled up two glasses... hmm... this must be too easy... sure enough, he sat down and commented that he had just seen a little boy put his glass back INTO the case. A one-time happening? No. The ladies clearing tables were taking USED glasses off people's trays and putting them back in the case. I think the US Health Department would have had a few complaints...
We decided not to drink our water, and waited for our number to be called. However, the cup-sharing phenomenon was obviously not weird to anyone else in the room, so maybe if we got really thirsty we would give it a try. All of this after our neighbors had warned us that local restaurants tend to reuse drinking straws to cut down on costs... so don't drink out of straws, or cups...