Like you, we have been going to the island for over 20 years and have never had a problem drinking the water in the places we stay. As to drinking the water in a restaurant we normally have wine or beer. Do the restaurants you favor use bottled water to make their ice? Most bars we frequent do use bottled water to make a drink like scotch and water. I suspect that the cost of tap water may have something to do with their use of bottled water since customers would be upset if they were charged for a simple glass.