I used 1/4 cup of conditioner, a mixture of castor oil, olive oil and Hot Six Oil that equaled 1/4 cup and two TBS of Nature's Gate Herbal Conditioner. I didn't have any powdered herbs, but someone else (kasey? hada?) suggested the NG conditioner. It has nettle, cherry bark, burdock, lavender and a lot of other good herbs in it.
I mixed up a jaborandi and sage hair tea called Nature's Wonderland Herbal Hair & Scalp Conditioner (from pennherb.com) and used that instead of plain water. I'm not sure how much to add because I used too much. Boil 2-3 cups and add it 1/2 ounce at a time.