I have been watching those "dry ice bomb" videos, and think that the concept is really cool. But, I am unable to get ahold of dry ice. How other than dry ice could i make a mixture that produces enough gas to rupture a bottle? I was thinking filling a bottle half way with vinegar, and putting a coffee filter full of baking soda in and shaking after i put the cap on. OR putting mentos inside, but inside of a roll of paper, so when i shake the paper will saturate and the soda and mentos will mix... These are all probably stupid, Any suggestions?