Street view from Google is not a permitted source. If you are sure that there is a functioning drinking water point there, you can easily add it yourself. To do this, go to “Edit” in https://www.openstreetmap.org/#map=19/45.12789/14.05221 and add a “point” at the point where the drinking fountain is located. Type “drinking water”. Then upload using the button at the top right.
Greetings Andreas