Baking Soda and Vinegar Rockets

This is great fun!

Add vinegar. . .

Prepare and slide the baking soda packet into the bottle. . . 

Quickly cork the bottle and set it upside down in place. . .

Back away. . .

Wait for it. . .

Blast off ! ! !

Retrieve the bottle and go again!

Supplies:  
Baking soda
Vinegar
Toilet paper squares
Plastic bottle
Cork

Fill the bottle with about an inch of vinegar.  Put about a table spoon of baking soda in the center of the T.P. square.  Fold the paper around the baking soda into a neat little packet that will be narrow enough to fit through the opening in the bottle.  Working quickly, drop the T.P./baking soda packet into the bottle, cork it, place it upside down on the predetermined launch pad, and back away.  Be patient, it will be worth it. 

It's best to use a strong plastic bottle of the ~16 oz. variety that can be found in the recycling bin.  I found corks at an army surplus store near Idaho Falls, but I've heard that you can get them on eBay, Amazon, Lowes, Etsy, Craft stores.