Place the dry ingredients in a bowl and then whisk ingredients until mixed thoroughly.
In a separate container, mix the liquid ingredients together. If adding colorant, or essential oils be sure to add them here and mix well.
Slowly add the liquid mixture to the dry mix, one small spoonful at a time. Do not add too much liquid at once or the citric acid will be activated.
Add the liquid until it is all mixed together. It should be a consistency that can pack well together.
Pack the mixture into a bath bomb mold and pack tightly, then let it dry overnight (or longer if needed or you are in a humid area). You will need to work quickly so that they do not start to dry out before they are packed into the molds.