To make your own, simply purchase essential oils and add to water. I have read formulas of 30-40 drops per cup of water. Simply put in a spray bottle (mist spray is best) and you are done. Shake well before using.
I think this would be a great gift for teachers that your kids could make. They could help choose the oils. I think orange clove would be nice. Or maybe rosemary mint. Or lavender. Or maybe a pine scent. Oh the choices! Wrap the bottle with scrapbook paper or print out a label on your computer, add a pretty ribbon and tag and voila! You are done!
Amazon sells some of these oils as cheap as $2.50 a bottle. Amazon also has a pack of Pack of 12 Fine Mist Spray Bottle 2.5 oz. for just $7.09.