Unable to answer "Is drinking water available here? If so, what is its source?" – Drinking Water – node/5316296723 via StreetComplete 62.0:

Water doesn't come out

In context of overlay "Surfaces" – Driveway – way/846157803 via StreetComplete 60.1:

Parkhaus Eingang

Attached photo(s):
https://streetcomplete.app/p/260710.jpg

In context of overlay "Things" – Animal Watering Place – node/2415689694 via StreetComplete 58.2:

È una fontana di acqua potabile, anche per persone