Permethrin works amazingly well for me here in MN! Used it last year in the BWCA in mid-June when the mosquitoes were THICK, and they wouldn't touch anything that was treated with it yet it's odorless and lasts weeks per treatment. I mix my own up - buy this and mix it at 2 ounces per gallon to match the Sawyer stuff:
http://www.amazon.com/Permethrin-36-8%25-permethrin-Quart-6666105/dp/B0048EY6KY/ref=sr_1_2?ie=UTF8&qid=1436471514&sr=8-2&keywords=permethrin
