Place water into a teapot and start to bring a boil.
2 cups water
Chop the castile soap - the more finely you chop it, the quicker it will melt. Place chopped castile soap and glycerin into a small pot and turn heat to low. Stir and begin melting.
2 ounces pure castile soap, 1/2 cup glycerin
Once the water boils,pour it slowly over the glycerin and castile soap. Stir gently until dissolved, then let cool.
Once at room temperature, add essential oil and stir to incorporate. Pour into a glass jar and seal.
15-20 drops essential oil
To use, add 1/8 to 1/4 cup to bath water as the tub is being filled. This will keep up to 2 months.
Notes
This will not be the super foamy bubble bath you buy at the store. With no surfactants, it can't be. The harder your water, the fewer bubbles you will have, but enjoy the softness of your skin from the moisturizers and essential oils!
For more tips and tricks, be sure to read the full article above.