Label a quart-sized plastic zip-top freezer bag “Baby's Ice Pack.” Writing down the contents of the homemade ice pack will help prevent any confusion later.
Fill the plastic zip-top bag with 1/2 cup rubbing alcohol and 1 1/2 cups of water. The alcohol keeps the water from freezing completely, so the ice pack remains pliable.
Close the bag. Place this closed bag into a second quarter-sized plastic zip-top bag. Zipper this second bag as well. This will ensure that the liquid will not drain from the interior bag if it rips.
Place the bag into the freezer. It will take several hours for the liquids to freeze.
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