I found the first two techniques better than the reusable ones you buy at the drug store.
- To make a "small ice pack" :one cup rubbing alcohol, two cups water and one quart size zip lock plastic freezer bag.
- To make a "large ice pack" :two cups rubbing alcohol, four cups water and one gallon size zip lock plastic freezer bag.
- Use rice to create a mild ice pack. Insert 1 1/2 cups of rice into a sandwich sized, plastic zip seal bag.