If you like to camp, rinse well and save empty quart and half-gallon cardboard orange juice cartons. Fill with water an inch from the top and freeze. Pack the cartons in the cooler with your food items and you will have cartons of cold water to drink as the ice melts, or ice on hand (pack a hammer to tap on the sides of the cartons to shatter the ice; open the top flaps to pour out the amount of ice you need.)
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