There's one thread in the topic about water bottles at the airport here https://community.ricksteves.com/travel-forum/packing/no-more-single-use-plastic-water-bottles-sold-at-sfo#top
that stands out for me from all of the fuzzy split ends in those comments:
Drinking fountains, at least indoors or non-public, seem to be fewer and farther between in Europe than in the USA --
the outdoor public drinking fountains are part of the local civic charm in many cities, but it seems like inside museums and department stores and shopping galleries, etc. that there is a difference that I assume is reflected in building codes.
Big buildings in the USA tend to have drinking fountains available and easily discovered, but in Europe not so much. Anyone else notice this? Or am I off on a wrong track?
Have I found another generalization about 'America is like this, Europe is like that'? Here in the USA the outdoor drinking fountains are often poorly maintained, while the public drinking fountains in Europe still have an air of community pump/well about them...