Add the Vitamin E oil and Vanilla essential oil to the epsom salts (if you are using these optional ingredients) and stir until they are completely absorbed into the Epsom salts. It should look like the texture of snow.
Mix the Epsom salts, powdered milk, and honey powder together until well blended.
Add any dried rose petals or lavender buds and mix them in.
Transfer the bath soak to a jar with a tight fitting lid to store.