Does the peach tea at sonic drive in contain artificial sweeteners?

I'm thinking it does, I can't find ingredients listings for it. Tastes like it. I got a migraine from one today, I think. After calling Sonic's information line I was told that the sweetener is sucralose, aka Spelenda. Splenda® Brand Sweetener, or sucralose, is made from a process that begins with sugar through a patented, multi-step process that selectively replaces three hydrogen-oxygen groups on the sugar molecule with three chlorine atoms. The result is an exceptionally stable sweetener without the calories found in sugar. After consumption, sucralose passes through the body without being broken down for energy.