I'm sure one can stop into banks, government buildings, hotel lobbies, etc etc etc and grab a sip or two from those fountains - but the ones that were specifically made for use by anyone at anytime are mostly gone.
Actually, I'm joking. But only somewhat.
During the late 1980s, on my first trip to Boston, a friend and I were on Harvard Square on a hot summer day when I needed to unload the bladder.
I
assume eateries in the area had restrooms.....for customers.
Well, neither of us wanted to spend any money at the moment--we were waiting for his wife to show up, after which we'd do that--and so I inquired about a public restroom.
Harvard Square's pretty big, but there was only
one public restroom in the whole square, on the second floor of a faraway business. Unisex, I imagine, as all it had in it was a commode.
Tens of thousands of people pass through Harvard Square every day.
This friend, living in Massachusetts, had gone to the University of Nebraska the same time I had. He was always boasting about the "superiority" of Massachusetts over Nebraska, though.
No way. Out here in Nebraska, we take care of visitors; public restrooms all over the place.