If you insist on a wet brine, just use salt and water. Anything else you put in a brine is wasted. The molecules are too large to penetrate the muscle fibers. The wet brine will make for a more forgiving bird. It's less susceptible to overcooking because of all the water that gets absorbed by the meat. The downside is that the absorbed salt water displaces the natural chicken juices, leading to bland meat.
I actually tested this firsthand last Thanksgiving. We did two small birds, one with an elaborate wet brine and one with just a simple dry brine. Both were equally juicy because we were careful with cooking times. But the dry brine was MUCH more flavorful. It tasted how turkey should. The wet brined bird was bland, mostly served as a vessel for gravy. None of the flavors present in the wet brine were detectable in the finished product.