Add witch hazel or rubbing alcohol to the spray bottle.
Add your essential oils of choice.
Swirl the bottle about 10 times to combine oils with witch hazel.
Top off with water, leaving a little room at the top for shaking.
To use
Shake well, and spray into the air.
Notes
Distilled water is purified of all impurities, so it will last longer. You can also use filtered tap water, but if it starts to smell "off" then just toss it and make a new batch. Do not spray directly on fabrics. Use caution around children, pets, and pregnant women.