What you need3 parts water
1 part rubbing alcohol
Snap lock bag or heat sealed bags
Blue food coloring
Ideally a heat sealer would complete this project but you can make it using strong plastic sealable bags.
Pour the water and alcohol and blue food coloring into a bag.
Seal that bag before adding another bag and sealing that one.
The way it works is that the alcohol will not freeze leaving you with a smushy frozen gel pack.
NOTE: Tint it with the dye as to avoid accidental consumption.