Believe it or not a cooler can keep food warm too. Don’t let it’s name fool you! The insulation works just as well for both situations. To keep food warm, wrap a few bricks in aluminum foil, heat on the grill or in the oven while you prepare your food. Line the bottom of the cooler with newspaper, brown paper bags, or foil. Using pot holders, place the bricks on top, then your food. It will stay warm for hours!