Dear Mary: My husband says that it costs more to make ice in the freezer than to buy it in bags. I find that hard to believe. Do you know the answer? — J.M.
Dear J.M.: Let’s say a 10-pound bag of ice at the store costs $2. Two dollars’ worth of water from your tap would be nearly 350 gallons at the U.S. average price of about 0.0058 cents per gallon — enough to make a lot of ice. You are already keeping the freezer at zero degrees F, so it will take no more energy to make ice in it than you’re spending now to freeze other stuff….