Pour approximately 12 ounces of polymer crystals into a plastic bucket. Add 10 cups of hot water to the bucket and allow the products to remain for at least two hours.
Pour the hydrated polymer crystals into three to four large, zippered plastic freezer bags. Stack the bags inside a freezer and allow them to remain until the polymer crystals are completely frozen, or at least four hours.
Arrange the items you want kept colder on a single shelf of the refrigerator. Remove the bags of frozen polymer crystals from the freezer and surround the arranged refrigerated item with the crystals.
Check on the items, and the crystals, to ensure they are remaining frozen. Consume the refrigerated items kept colder by the polymer crystals immediately to ensure they don’t spoil.