Unable to answer "Is drinking water available here? If so, what is its source?" – Drinking Water – https://osm.org/node/13704338452 via StreetComplete 63.0:

It is a water refill service where one can buy purified water by the gallon(1;2;3;5 Gallons). Couldn't find the option for something like this.

Attached photo(s):
https://streetcomplete.app/p/335799.jpg