Supplies: plastic bottle
food coloring (optional)
Instructions: Pour vinegar into plastic bottle (mix food coloring in ahead of time if you want). Our bottle was 12 oz. and we filled it about 1/4 of the way full...it's not an exact science, we're still experimenting to get the perfect explosion. With a funnel, dump about a Tbsp. of baking soda in the bottle with the vinegar, then stand back to watch the volcano erupt!
We made several of these.
And tried different colors too!