Unable to answer "Is drinking water available here? If so, what is its source?" – font de l'Arquitecte (Drinking Water) – https://osm.org/node/2351682068 via StreetComplete 59.2:

Se trata de una fuente en desuso. Hay dos placas no oficiales en la fachada que dicen: 1) 1925, Font de l'Arquitecte; 2) Gaspar Bennàzar (Palma 1869 - Barcelona, 1933) Palma 2011

Attached photo(s):
https://westnordost.de/p/247928.jpg