I don't make much real iced tea anymore, but I keep a running supply of rooibos refrigerator tea going all summer long. It's really good iced, and you don't get the bitterness. (Zinger teas are good, too, but those are way too far off tea, so I know I'll be banned if I mention them non-parenthetically.)
I mostly use the bottles from
this stuff, as they're the right size and the mouths are a good size and shape for tea bags. (It's p. good limeade, also, but way too expensive unless you're buying it for the bottles.) I have a bunch of bottles, and wash them out and refill them as they're used so that we have a perpetual supply. I've found that works much better for us than having one big thing of it.
This also works with actual tea, but srsly, try the rooibos too.