We have fermented the frozen ice tea before.
10 cans of frozen ice tea (sorbate free, $0.79 cans)
2 kg of dextrose
water to 23l
backsweeten with 3 cups of splenda
keg to carb
Of the juices that I have done, it is not my favorite. (I prefered lemonade or margarita mix or a 7/3 lemonade/limeade.) It was an easy ferment (vs the acidic lemonade).