In a large plastic container with a lid add 8 cups water, 3/4 cup salt, 3/4 cup brown sugar, vinegar and 1 tablespoon of the BBQ seasoning. Stir until well mixed. Add the chicken to the brine and refrigerate at least 2 hours and no longer than 4 hours
Preheat the oven to 350 degrees F.
Remove chicken from brine and pat dry. In a small bowl combine 1 teaspoon of salt, 1 tablespoon of brown sugar and 2 tablespoons dry BBQ seasoning. Rub the outside of the chicken with spice mix and transfer to a roasting pan. Add 2 tablespoons of water to the bottom of the pan and put in the oven. Roast for 45 minutes or until the internal temperature at the thickest part of the meat reaches 160 degrees F on an instant-read thermometer. Remove the chicken from the oven to a cutting board. Allow the chicken to rest for 5 minutes, loosely covered with foil, before carving and arranging on a serving platter. Enjoy!