Right, it depends I guess. I was more thinking how restaurants are legally obligated to provide free (potable) water, not sure how much this is an incentive for

Right, it depends I guess. I was more thinking how restaurants are legally obligated to provide free (potable) water, not sure how much this is an incentive for them to have their tap water potable ? (And I guess they already need to have potable-after-boiling water anyway just to be able to cook ?)