Here's what Pinterest promises:
To make your own shapeable ice pack for booboos and sprains: Mix 1 part rubbing alcohol with 3 parts water in a ziploc bag. Double bag it with another ziplock bag, and put in the freezer. Pull out and put inside a tea towel or fabric bag, use on sprains, strains and other booboos. (disdressed.blogspot.com)
Here's what I did:
I gathered the materials (which is luckily something that is always in the bathroom cabinet).
I took a picture of a bottle of rubbing alcohol, an empty
ziploc baggie, and a glass of water ... but then deleted it on accident
I mixed 1/4 cup of rubbing alcohol and 3/4 cups of water in a snack size baggie. Stuck it in the freezer and
forgot about it waited.