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!
Step 2: Fill the Large Bag With Calcium Chloride
Step 3: Fill the Smaller Bag With Water
Step 4: Combine Bags
Step 5: Instructions for Use.
*keep all the pellets at the bottom
*put the water bag in with the seal facing down towards the pellets
*seal the bags verry well, you could even glue them shut for a better seal
Tell me what you think!
*leave a comment! PM me!
EDIT: 8/7/09 Fockers sugested an easier way to pop the inner bag without breaking the outer bag, quote: To pop the small bag, just rub the seal and it should slide itself open