In a medium bowl, mix the baking soda, citric acid, and sea salt. If there are any clumps, break them up.

In a small bowl, melt the coconut oil (either in the microwave for a few seconds or in a double boiler)

Add the essential oils (if using) to the melted coconut oil.

Slowly pour the coconut oil mixture into the dry mixture and mix well,

You should start to notice that the mixture will start to stick together.

When you think the coconut oil is mixed throughout, squeeze the mixture in your hand to see if it will stick together.

If it's not sticking together well, spritz it with witch hazel. Just one squirt at a time as too much moisture will cause the baking soda and citric acid to start reacting.

Pack the mixture into the bath bomb mold. I just use a 1/2 cup measuring cup. I find this is the easiest way to form them and get them out.

If you want to have some dried herbs for decorations on the outside of the bath bomb, put a bit in the mold before packing the bath bomb mixture in it.

If you are hiding a small treasure in the bath bomb, pack it in the center of the bath bomb.

Once the mixture is packed tightly, turn it out onto a piece of wax paper or parchment paper..

Allow the bath bombs to dry for several hours.

Wrap the bath bomb in cling wrap and tape closed. You can also use wax or parchment paper and twine or string to wrap them a second time.

Store bath bombs in an air tight jar.