It was a big struggle for me in germany. I have a condition that makes swallowing food very difficult and have to essentially "push" food down with a lot of water.

I would easily need to buy 2-3 .75l bottles per meal, so instead I bought 1 bottle and brought a reusable water bottle to every restaurant. No one complained, and I did always buy at least a drink.

But if you just let me have tap water, or even have tap water after purchasing a drink I could have enjoyed a meal without rationing my water.