Fizz your own drinks
Most people would understand that Juice is good for you but is boring and soda drinks are bad for you and yet are exciting to drink, so what do you do here.
First up but this carbonation kit; get your hands on some vinegar and baking soda. Now you make your own fizzy fruit juice, that is a healthy and yet fizzy drink, cool!
U-FIZZ Drink Carbonation Kit – Carbonate any beverage using easy to find ingredients. Make those kids drink their juice by adding fizz. Includes: Baking soda cylinder, sleeve, connector tube, and instructions, Not Included (but needed): 16oz of white vinegar, baking soda, beverage, 2 2-liter bottles, funnels (if you want to be tidy). Dimensions: Baking soda cylinder: 0.75″ diameter x 8″ tall, Connector tube: 21″ long and priced at $6.99.
Source [Think Geek]
