- Put a box of baking soda in a dish
- Color vinegar with food coloring
- Give the kids an eyedropper
- Clean the kitchen and do laundry (or whatever is outstanding in your house) while they entertain themselves
And the mess begins.
It must have made some kind of memory for them because they always ask to do it again, and honestly I let them. They enjoy it and the mess gives me something to do (as if I don't have enough already)!