A friend and I recently split a package of Twisty Droppers. While the Xander had fun playing in the pool and the tub with them, I wanted to do something special also. Cue the vinegar, baking soda, and food coloring!
I even let him help me add the food coloring. He does not quite have the concept of squeezing the dropper before putting it in the liquid, but he is pretty good at getting the liquid to suck up and then squeezing it where he wants it. I was happy to have him practice with those little hand muscles!
He had a great time! I explained that the vinegar and baking soda react and release a gas, so of course the rest of the morning he kept saying "I made gas... I mad GAS!"