from my TD cookbook I wrote -
Before I get into the brine I would like to explain that salt plays a very important part when brining. And different salts need to be measured and used - depending on the salt you are using. Their weights and volumes are not the same.
2 cups of Diamond Crystal Kosher Salt is equivalent to
1 ½ cups Morton Kosher Salt or
1 cup Table Salt
For example - if you need 1 ½ gallons of brine, you will use ¾ cup Diamond Crystal Kosher Salt, 3/8 cup brown sugar, 2 to bay leaves, 2 ¼ teaspoons whole black peppercorns, ¾ bunch fresh sage and ¾ bunch fresh thyme.
If you need 2 gallons of brine, you will use 1 cup Diamond Crystal Kosher Salt, ½ cup brown sugar, 3 to 4 bay leaves, 1 tablespoon whole black peppercorns, one bunch of fresh sage, and one bunch of fresh thyme.
This is just a basic brining recipe - you can use dried herbs or any herbs or choice.
To make your brine - use one quart of water (which you subtract from you gallon measurement - basic math - 3 quarts of water left per gallon). Place this quart of water in a saucepan with salt and brown sugar, stir over medium-low heat until salt and sugar has dissolved, remove from heat and add herbs. At this point you can cool completely and add 3 quarts cool water and add to brining pot OR you can pour the hot brine mixture into your brining pot and add 2 pounds of ice (which equals one quart of water), stir to melt and add 2 quarts of cold water.
I have much more info on turkeys if you want a copy of it -