20 drops Lemongrass Essential Oil
20 drops Citronella Essential Oil
Mix Neem Oil, Peppermint, Lemongrass, and Citronella in the spray bottle, once mixed, fill the remainder of the spray bottle with water and shake well. Voila! You've got a whole lot of bug busting power for very little $!! Shake well before each application.
The essential oils I have linked within the recipe should last you at least an entire bug season.