I don't have enough brine to fully submerge my turkey!

Oh no! Can you dash out to get a container big enough to fit the turkey and brine? Raw poultry is a food contaminant and I worry about having it directly in your refrigerator drawer. If you don't have anything big enough to completely submerge the turkey, I would recommend either spatchcocking it so it's a little more flexible or just rotating the bird every few hours so no one part is left out of the brine for too long.