I use
1/2 Gal water
1/2 gal apple cider or apple juice
1 cup kosher salt (Diamond,
not Morton - Morton too salty)
1/4 cup peppercorns
8-10 whole allspice berries
Few sprigs each of thyme, rosemary, sage
6-8 bay leaves
3-6 cloves peeled garlic
1 orange, cut in half, juice squeezed into the brine, then toss the orange halves in as well
Adjust accordingly for more or less brine, depending on size of bird/s
Have been using this for years, rave reviews every time - birds always juicy and tasty
Too many more flavors start to overpower the taste of the bird. Mind you, if you have a bland supermarket-type bird, you may want to add more flavors to the brine.
But we always use farm-fresh birds and dont want to change the taste of the meat - just give it a subtle hint of herbs/spices and sweetness, and of course, make it juicy