Multi-use antibacterial. To treat acne- mix 4 drops of tea tree essential oil with 4 tablespoons water; apply to skin. For athlete’s foot- apply oil to fungus. Cold sores- mix 4 drops oil with 4 tablespoons olive oil. Apply to sore. Yeast infections- Add a drop or two of oil to 2 cups of water, and use as a douche. Repeat daily for two weeks.