Balloon, backing soda, vinegar, and a bottle.

Step 1: First step.

Take the balloon and fill it up with baking soda fill about half the balloon.
Um..... Did you know you named the instructable, "Heres what you will need;" I think you would want that to be the page title, not the 'ible title. You should call the 'ible something like, "CO2 Project "

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