don't know if you have a proper answer yet, but legally YES. A diner in a restaurant is entitled to tap water free. Motorway services and fast foods (ie Flunch, MacDo) are different and have different legislation, but a normal hotel or roadside restaurant must provide water free of charge. The only exception is in a bar where you can refuse to offer tap water if the person is not consuming anything else. But in this case, again, this must be very clearly indicated so the customer can see. If she didn't have a carafe she could have given you a glass..... I am a restaurant owner and receive L'Hotellerie magazine every week and this is a question often found in the q&a page. The answer from the lawyers is always the same.
