Edible Chemistry is probably the most popular activity at Camp. You can buy the kit. Save the small bottles and mini-scoop for reuse. The chemicals in the kit are baking soda, citric acid, red cabbage powder, sodium alginate and calcium lactate. The kit has food-grade calcium acetate. Calcium lactate substitutes well for calcium acetate. Baking soda is basic; citric acid is acidic.
Here and here are a few red cabbage experiments. Here are instructions to make red cabbage indicator solution from a head of red cabbage---even cheaper! Try Edible Water Bottles with the sodium alginate and calcium lactate. Try GummyWorms; substitute food-grade calcium lactate for calcium chloride. Here is food-grade calcium chloride. I keep the little containers and refill them. I made up science kits with cassette cases, mini-test tubes, plastic pipettes, and craft sticks. Put the contents in a plastic coffee can with the instructions.
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