Pam, folks seem to fall into two brining camps...those who like it and
those who don't. Non-briners feel it makes the meat mushy and that can certainly happen if you brine for too long....like 48 hours.
Personally, I like to brine turkey, possibly because I grew up in a home where over-cooked turkey was the norm. Then I was introduced to my MIL's 12-hour "roasted until there was no hope of redemption" turkey which managed to make my mother's seem positively moist! And we would have to eat dinner at BOTH houses! I no longer think of cranberry sauce as a condiment, but instead, as a lubricant to slide bone-dry turkey down my throat.
The first time I brined, the turkey was so moist I was actually startled. "Aha!", my little brain said: "THIS is why people LIKE turkey. It's not
supposed to taste like a library book left out in the rain and dried on the living room heat radiator."
If I understand the osmosis idea correctly, you simply need salt and water to brine. Sugar/honey is added to help brown the meat. Other liquids (wine/apple juice/broth) are variations on the water. Seasonings and spices mix up the taste.
Be careful which salt you use: if the recipe specifies kosher salt, then using the same amount of regular table salt would be too much. Also, if you plan on basting with a canned broth, use a no-salt or low-salt version.
Standard ratio for a large turkey is 1 Cup kosher salt: 1 Gallon of water.
I find that too salty. I use 3/4 C of kosher salt to 3 Quarts of water, 1 quart of apple cider, 2 TBL mild honey, a bunch of peppercorns, fresh rosemary, and fresh thyme. Sometimes I add the juice and peel of a lemon, but that's more often for brining whole chickens.
I do rinse afterward and blot, blot, blot dry because I don't want the meat steaming in the oven.
Most recipes do not recommend stuffing the turkey after brining, but I've done it with no ill-effect.
Read the reviews on the W-S bags...most people loved them but a few had problems with the zipper, size, etc.
http://www.williams-sonoma.com/products/brining-bag/#reviews