sheets of toilet paper on a table.
carefully sprinkle baking soda across the sheets of toilet paper.
spread the baking soda out evenly and roll up the toilet paper. be sure to roll it up tight enough that it will fit inside the bottle.
fill the soda bottle approximately one quarter of the way with vinegar.
add a few marbles or small rocks to the bottle. you want to add enough weight so that the cap of the bottle will be under the water.
place the toilet paper with the baking soda into the bottle of vinegar and quickly put the cap on the bottle.
place your boat in the water and watch what happens!
experiment with 