In germany, you have to buy water in all restaurants. This results in purchasing plastic mineral water bottles. Sad state of things.
It was very noticeable when I passed through Dubai airport and tried to fill up a water bottle. I tried several cafes and all told me they don't do that, I'd have to buy bottled water. I've never been refused that in the UK when asking politely. Ended up finding the water fountains, but I think there was only 1 fountain per terminal, and 2/3 weren't working when I visited.
But of course, it’s a convenient excuse to sell bottled water. Not impossible to have water delivered for a drinking fountain.
And the water tastes salty.