Brasserie Buitenhuis in Valkenburg

We have been served very friendly and have had a foretaste of a bitterbal it was different but good. When we asked for water we were brought two bottles of water each bottle 2 euros. When we left i wanted to take The bottles with me but i was asked to leave them behind because the brasserie were going to refill them! I wonder if we drank water from the tap and payed 2 euros per person for it!! It was not correct because we paíd for this brand of water. I suppose we had the right to take the bottles with us.