Purchase two or more hot packs from a retail, home improvement or camping supply store. Warm the packs according to the instructions on the container they came in and then wrap your food in aluminum foil. Place the food in the aluminum-lined ice chest and then place the hot packs around and under the food. Fill any empty space with a kitchen towel or old crumbled newspaper. The hot packs, kitchen towel/newspaper and foil will hold the heat inside of the ice chest.
Do not open the ice chest until you are ready to serve the food.
If you can't find or don't have time to buy hot packs, wrap your hot food in heavy aluminum foil and place it in the ice chest. Then crumble up five or more pieces of newspaper and pack it under and around the food in the aluminum-lined ice chest. Pack the newspaper tightly into the chest all the way to the top. Place the lid on the ice chest and keep it closed until you are ready to serve the food. The food inside of the chest will stay warm for about 90 minutes.
Once you are done using the ice chest, wipe it clean with warm soapy water to remove any spills, dirt and debris. If the chest is still clean or no spills are present, wipe it out with a damp cloth. Reline the ice chest with aluminum if needed. To disinfect the ice chest, wipe it out with a cloth soaked in a 50/50 vinegar and water solution.