Brewing Instructions To use Orange (Bitter) Essential Oil in aromatherapy, add a few drops to a diffuser filled with water. Allow the diffuser to disperse the oil into the air, filling the room with its refreshing aroma. For topical applications, dilute the essential oil with a carrier oil, such as jojoba or coconut oil, before applying it to the skin. This ensures that the oil is gentle and safe for use on all skin types.