Measure your Epsom salt , mustard powder, and dried lavender* into your plastic baggie.
Press most of the air out of the bag, and close the zipper on it.
Manually crush any clumps in the salt, and work to combine the ingredients.
Open the bag, use an eye dropper to measure the essential oils into the baggie.
Push out the air and close the bag one more time,
Massage, shake, or otherwise agitate the bag to distribute the essential oils throughout the mix.
Transfer mixture to an airtight container, or measure into bath tea bags. Filled bath tea bags should also be stored in airtight containers.
To use, measure 1 cup of Mustard Bath - or throw one bath tea bag - into a hot running bath. Soak for 20 minutes, rinse off.