I have a science project I'm doing for my DS's preschool (I know I'm in the Homeschool group, I lurk. you guys have great ideas!) it's basically seeing the reaction of vinegar in baking soda and mixing colors.
there are 17 kids. I thought to do 5 trays of Baking soda split between them. but how do I give them the colored vinegar without giving them bowls of liquid to be spilled? They are supposed to be able to drip it in like an eye dropper.