Problem is there are two ways to decaf., such beverages. One which leaves most of the goods intact one that doesnt. I cant remember the name of them but a search should turn up some info in Article by I believe both Cy and Shugart.
Oh aklso dont get it in the can. I read recently in ( cant rememeber which mag. I thinkl life extensions) that teas in a can are worse on your tooth enamel etc.. than even regular Coke or pepsi with the sugar. It leaches chems. froom the can.
I say brew a bunch up and put it in the fridge them you know it has what you want.
Oh but yes inn a pinch that Arizona stuff is pretty good taste wise at least.
Hope that helps,