This is very location dependant. In southern Europe there are places where most normal people actually would refill their water at the fountain when going throu

This is very location dependant. In southern Europe there are places where most normal people actually would refill their water at the fountain when going through a town, and I have even faced small queues when the fountain is small but a slightly larger group is refilling bottles. In many small towns you don't even have a shop so buying bottles is not even an option. There's sometimes a local bar / restaurant but if you want to just get water that's a bit overkill.