Who doesn't love the fizzing action of a bath bomb as it hits the bath water!  For a basic bath bomb, you will need 1 part citric acid to 2 parts sodium bicarbonate (baking soda).  Spritz with Witch Hazel and mix with your hand until the ingredients clump together like wet sand.  (Be careful not to add too much Witch Hazel or your ingredients will begin to fizz.)  You can also add a few drop of your favourite carrier oils, and scent your bath bombs with essential or fragrance oils.  Once you have the "wet sand", firmly pack your bath bomb mixture into your mold.  Then carefully turn your mold over to gently release your bath bomb on a sheet of wax paper.  Let your bath bombs dry for a few hours and then you are free to package them any way you like.