I know it's heresy--a "Northerner" giving you a recipe for the ubiquitous drink of the South! But to be honest with you, I never quite knew how to make really good iced tea--it would be bitter, too weak, too strong, etc. So I started looking for an honest-to-goodness recipe and found this one which I've tweaked a bit to suit us.
According to American Table, the first published recipe for sweetened, non-alcoholic iced tea appeared in Marion Campbell Tyree’s 1879 community cookbook Housekeeping in Old Virginia Containing Contributions from 250 Ladies in Virginia and Her Sister States. Quite a mouthful, isn't it?
And most of the tea used back then was green tea which is suddenly so in vogue again and which, during World War II, became impossible to get since it was imported from Japan--that's when black tea began appearing in everyone's cup.