Fill half a soda bottle with white vinegar. Add about 1 tsp of baking soda (we wrapped in toilet paper) and drop in the bottle. Quickly put balloon over the top of the bottle and watch it inflate.
Fill half a soda bottle with white vinegar. Add about 1 tsp of baking soda (we wrapped in toilet paper) and drop in the bottle. Quickly put balloon over the top of the bottle and watch it inflate.