For anyone with tendonitis or an injury that requires icing here’s an easy and cheap way to make a homemade gel ice pack. Take a ziplock bag and fill it with water and rubbing alcohol. A 60/40 mix of water to alcohol is probably best but you don’t have to be too specific; just make sure there’s enough alcohol to prevent the water from freezing solid. Fill the bag only about half way so that it stays pliable. Next, seal the bag, trying to get most of the air out. Use duct tape to tape the bag shut so that it doesn’t spring a leak. Put the bag into another ziplock bag and tape this one shut as well. Now you’re done. Throw the bag in the freezer and let it freeze over night and you have an ice pack that’s less messy than ice cubes and molds to your body better.
A word of caution: don’t place the frozen bag directly against your skin as this my cause frostbite. Instead, wrap the bag in a towel before using it. I took an old towel and sewed it into a pouch that the bag can slip in.