Combine witch hazel and all essential oils in a glass jar with a tight fitting lid (I like to use a Ball canning jar). Twist the lid on tightly and shake vigorously to combine all the oils together.
Place the funnel in the opening of one of the 2 oz glass bottles and pour in the mosquito repellent almost to the top, leaving room for the tub on the sprayer top. Twist the cap on the spray bottle on tightly. Repeat with the remaining 2 bottles. Store in a cool dark place until ready to use.
Shake gently before use and spray liberally on all exposed skin and on clothing to repel mosquitoes and other insects.