Start by purchasing the essential oils of your choice at a natural food store or fragrance shop. You can also purchase the essential oils online.
Combine one ounce of essential oil of your choice with 2 1/4 ounces of dipropylene glycol in a small mixing bowl and mix thoroughly.
Pour the oil mixture into a glass bottle or vase and stir in a few drops of candle dye or food colouring.
Insert a few reeds in the glass bottle so that the lower ends of the reeds are in the oil mixture, and let stand for 3 to 5 minutes.
Then, turn the reeds over so that the top ends are now in the oil mixture.
The reeds will suck the oil mixture and start acting like an aromatherapy diffuser.