Its a little odd for me to be posting this in the middle of summer, but in hopes of another stay warm contest I would like to see your feed back to help improve this instructable.
EDIT: BE SAFE
please avoid direct skin contact with the solution! I am by no means a chemist, I do not know how safe this reaction actually is. I've heard several people say several different things. Some people claim this produces hydrochloric acid, but I never got burned from touching it. Whatever is actually happening doesn't matter, please be safe and do not touch the solution or inhale the fumes! Thank you!
EDIT: Published in Popular Science! :D
Step 1: Gather the materials
*one large ziploc bag
*one smaller ziploc bag
*some calcium chloride ice melter pellets
really it is!