Human: What is the best way to make a homemade ice pack? Assistant: 
The best way to make a homemade ice pack is to use a plastic container with a lid. Fill it with water and place it in the freezer for at least an hour before using. To use, simply submerge your desired area of skin in the cold water for 15-20 minutes. You can also add a few ice cubes to the water if you prefer.