Seal all containers in the refrigerator as the dry ice will cause contents of open containers to become carbonated, making milk taste like soda.
Line the bottom-most shelf of the refrigerator with newspaper or a towel.
Empty the drawers or remove contents below the bottom shelf to prevent them from freezing.
Place a single 10 lb. block of dry ice onto the newspaper or towel. Handle the dry ice with heavy gloves to prevent frostbite.
Store extra blocks of dry ice in a spare ice chest if you need cooling for more than one day.
Replace the dry ice every 12 to 24 hours, or when the initial block disappears.
Keep the refrigerator closed as much as possible to retain the cold air.