As a former Starbucks barista whose favorite beverage was the strong black iced tea we served (this was before the procedure included added water and sweetener), I can tell you exactly where you're going wrong; starbucks doesn't use tazo awake to make iced tea.
Tazo makes a special blend specifically for iced tea. While it is uncommon to find this tea packaged for retail sale, you can ask a manager to order it for you. They may not even know it exists, but if that's the case just politely tell them that a former barista told you it does exist and ask if they will check the catalog.
Incidentally, next time you order an iced tea from starbucks, I suggest requesting NO ADDED WATER. Starbucks is getting really cheap, cutting pennies everywhere, and they started adding extra water to the iced tea a few years ago. This is done while preparing an individual cup, so you can just tell them not to add it.
The boxes of iced tea come with 6 bags; I like my tea strong, so this makes 3 large pitchers of tea for me. Order accordingly.
Ooooh, I just found an online supplier; http://www.tedsfavoritecoffee.com/produ ... cts_id=274