1 pop bottle (ours was a 3 liter)
depending on the size of your bottle you will need 1 to 2 cups of vinegar
also depending on the size of your bottle, you will need about 1/4 cup of baking soda.
a few drops of red food coloring (unless you want a unique volcano with some green or blue)
(use more or less if needed)
We started with the baking soda in our bottle and in a cup mixed the food coloring and vinegar. Then we quickly poured them into the bottle (already full of baking soda) and stood back.It was so fun that we did it a few times. This is especially fun with younger kids who have never seen this before. the end result, a bubbly volcano. when i was younger we put toy dinosaurs around the bottom of the bottle and pretended it was a prehistoric eruption. Be creative and have fun with it.