1. In a mixing bowl, whisk together corn starch, baking soda and citric acid granules until thoroughly combined.
2. Sprinkle the mixture with the essential oils and whisk again until well blended.
3. Apply 2-3 spritzes of water to the mixture and stir in. Repeat just until the mixture is able to form a clump when squeezed in your hand.
4. Divide the mix into golf ball sized balls and let dry in a warm, dry place, (an oven with pilot light works well.)
5. Store the dried bath bombs in an airtight container.
6. To use, drop one bomb into warm bath water.