I is for Ice Pack. I discovered a way to make an inexpensive, reusable ice pack last year. Put 1 cup of rubbing alcohol and 2 cups of water into a Ziplock bag. Use a quart-size bag, or gallon-size, depending on what size ice pack you want.
Freeze the bag overnight. Next day, it's ready to use.
Alcohol doesn't freeze, so the bag will always be malleable. It will lay over a bony ankle, curve over a slopey shoulder, or lay flat over a sore back. When the ice pack becomes too soft, or warm, simply place it back in the freezer.