I bought several bottles of the 1.5 liters of water at Ralph’s grocery store. I have really been drinking more and so has Jonathan. I have always kept bottled water, but there is something about that BIG bottle of water that appears to be more of a challenge. When we went on our excursion on the cruise I bought a bottled water insulator that fits the 1.5 liters. I had frozen a bottle to take to the pool, it still had ice in it the next day! Had I known it was going to work that well, I would have bought two!