How to make bath bombs (bath fizzies)

Every gal knows that you can buy these at your local Bath store. Whoever thought that it was this easy to make your own for future use. There are two different tutorials. The first calls for witch hazel, citric acid and baking soda. The second is more complex, but has a detailed picture step-by-step.
Take your pick to create a nice soothing bath!
BoingBoing < BathBombs, notmartha