The basic recipe is so simple, especially if you make jams or dehydrate fruits and veggies. Then you will likely have citric acid on hand. If you don’t have any on hand, you can pick it up near the canning supplies and mason jars in most stores with a kitchen supply department.
1 part citric acid
2 parts baking soda
Mix thoroughly. Add a pinch or a whole cup to a tub of water to make it fizzy like seltzer water.
Spritz some witch hazel on it (read the label and avoid anything with water in it). Just wet it enough to help you form and press it into balls. Compressing them into golf ball size chunks would be perfect, but you have some room for creativity. Dry those balls a few days without handling them. Handling the balls too early will cause them to fall apart. Drop these in your bath for fizziness over a longer time.
Add some essential oils for fragrance and they become aromatherapy balls. You will love the smell of vanilla balls when relaxing in the tub.
Use red clay for a pink color to the bath bomb fizzy balls. Clay will make your tub a little slippery, so do not use much and be careful standing up.
Be careful adding this to a bubble bath or soapy water or you could end up with a Hollywood style ‘overloaded washing machine’. This will fizz more than pop, and a bubble bath will foam more than warm root beer into a cup of ice cream.