This is a simple way to make ice packs for the freezer that will never harden but gets very very cold. It is the simple formula of 3 part water to 1 part rubbing alcohol. In a gallon bag you would put 1 cup rubbing alcohol to three cups water in a quart bag you would add 1/2 cup rubbing alcohol to 1 1/2 cups water. Double bag! When you use it for one application wash the outside bag or remove and replace it so it is always cold. The rubbing alcohol will keep the water from freezing which makes this ice pack palatable to mold over your body. Keep more than one in the freezer so you can alternate. Replace water/alcohol mixture minimally once a year.