Heat the water in a small saucepan. Add the herbs and bring to a boil, then lower heat, cover and simmer for 20 minutes.
Strain off the herbs, reserving the water in a bowl. Add a bit more distilled water, if needed, to equal one cup of herb liquid and gently stir in the liquid soap. Add the essential oils and the 1/4 tsp of oil.
Mix and put into a plastic squeeze bottle.
To use, gently rock the bottle to remix the ingredients. Wet hair throughly, then squeeze a small amount on top, sides, and back of the head. Work into the roots and pull it down the length of you hair several times. Rinse out throughly.