Two of the restaurants I've been to recently served me water out of the kitchen faucet. The water was not filtered, it came straight out of the same faucet they use for washing dishes.
These two restaurants have open kitchen. That was how I saw them get the water from.
I am shocked. Isn't it unsafe to serve water from the same kitchen faucet that they use for washing dishes. I always assume that restaurants are supposed to use filtered water for customers or at least boil it first.
I used to boil my tap water before drinking. Nowadays, I buy water from one of those water dispensers you often see in front of a supermaket.