We southerners are SOOO spoiled, aren't we? I do know it is/was available at Trail's End once upon a time, as it was at LTT (and our server said it was their biggest selling beverage.)
Good luck! I know that WDW used to serve that nasty syrup-based tea, but most everywhere at least brews it now. But there's no replacing that silky-smooth texture and flavor that comes from pure cane sugar hitting hot, freshly brewed tea. It's actually a difficult drink to prepare properly. No one's tea approaches my mamma's.