Fruit Fly Spray! What You Need: Lemongrass Essential Oil, Hot Water, Small Spray Bottle. What You Do: Mix 10 drops essential oil per 2oz hot water. Shake well and spray windows, door ways, and anywhere you see the little nuisances. Bonus: this stuff works for ants, spiders, and other creepie crawlies as well. Credit: everydayroots.com