Unfortunately, the book gives an example that requires boiling liquids - not something you want to do with 16 excited girls!
We found some great ideas on Pinterest, though. One was particularly easy and got rave reviews from the girls and parents alike. ("We needed it last night," one mom said!)
Natural Air Freshener
Fill bottle with water until it begins to curve at the top. Add five drops essential oil. Cap and shake.
We designed Avery labels that the girls could label their bottles too. I'll post the template soon!