This is a super easy activity and more then likely you already have the supplies on hand. The boys played for an hour. I let me smallest one participate also but he had to be watched closely because he kept wanting to snack on the back soda so keep that in mind.
All you need is vinegar, food coloring, baking soda and straws/droppers or even spoons. Add food coloring to however many cups of vinegar you wish to use and give each kiddo a bowl of baking soda. Then they use they droppers or straws to drop the colored vinegar into the baking soda. When they collide magic happens and it makes a colorful mine explosion/eruption!!!