All you need to make this happen is baking soda, vinegar, food coloring (optional), pipette droppers, and a big pan.
I simply dumped some baking soda inside a 9 x 13 clear pan and shook it around to get an even layer. I used the kids' three-compartment plates and filled them with white vinegar. I dropped some food coloring into each compartment for added fun.
I gave each kid their own pan, plate (with vinegar), and a pipette. I found the pipettes at Walmart for $1.49 for a two pack. They were near the pharmacy.
Simply drop some vinegar into your pan of baking soda and watch as your colors fizz and turn into crazy creations.
This would be lots of fun on a rainy afternoon or a hot summer day when it is too hot outside. OR you can do this just because it is lots of fun. This is something we will definitely be repeating.