Suzy, I did a Google search for the Cracker Barrel recipe, but couldn't find it. I also checked at http://recipezaar.com and didn't find it. But they have a request forum on there, so you could post a request for it. Someone is always happy to help out over there.
My boyfriend works at Cracker Barrel, has for 5 years. He said they don't make the Raspberry Lemonade on site. It comes to them in the form of pre-made jugs of lemonade and pre-made bottles of Raspberry syrup. They just add a few squirts of the raspberry syrup to the glass of lemonade and stir it up before they bring it to you at your table.