Use colorful tape to decorate the outside of the 2-liter bottle. Use markers to add extra designs to the tape to give it a patriotic theme.
Pour about approximately 1 tablespoon of baking soda onto a tissue. Roll the tissue tightly around the baking soda, making a small bundle that is small enough to fit through the opening of the bottle.
Fill the empty bottle approximately 1/4-full with vinegar. Drop the bundle of baking soda into the bottle of vinegar. Working quickly, place the cap on the bottle and place the bottle upside down on a flat surface outside.
Now stand back and wait for the rocket to take off! This can take anywhere form 30 seconds to a couple of minutes, so stand back until the rocket has launched.
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