Combine all the ingredients in a bottle or jar. Pump soap dispensers and even foaming dispensers work well for this. If you use a foaming dispenser you may need to add ¼ cup of distilled water.
Shake well to mix.
Shake before each use and massage through the scalp.
Store your shampoo in the fridge after each use.
Notes
If you use a foaming dispenser, it also makes a great shaving cream.
The shelf life of this shampoo is about one week when stored in the fridge.