Unable to answer "Is drinking water available here? If so, what is its source?" – Drinking Water – https://osm.org/node/4221842710 via StreetComplete 63.0:

Bottle filter and fountain and pet bowl and tap all-in-one

Attached photo(s):
https://streetcomplete.app/p/330831.jpg
https://streetcomplete.app/p/330832.jpg
https://streetcomplete.app/p/330833.jpg
https://streetcomplete.app/p/330834.jpg