Just straight Morton's coarse kosher salt. No binder. I just pat the bird very dry and rub in the salt all over, then separate the skin from the breast and rub some in between there, and also in the cavity. For a 19# bird I used a little over 2/3 cup of salt. Then into the fridge uncovered for 36-48 hours. I might play around with additional herbs in the brine next year but I made compound butter with rosemary and sage that I'll slice up and put between the skin and breasts before roasting, so should be good.
I did wet brine for several years and was always happy with it, but the dry brine is just as good if not better, and much, much less work.