We always have 2 coolers on board. Each morning we load up one cooler with the warm beer, soda's, juices, etc. We take the water from the cold cooler and empty that into the cooler we just loaded with warm cans. We generally have a bag or two of ice in the freezer. Add a bag of ice to the cold cooler. As the day goes on and we make room in the cold cooler, we add the "pre-chilled" cans to the cold cooler and add another bag of ice. We keep drink ice in the freezer.