I love iced green tea, uncorrupted by added sugar. It has a sweetness that perhaps only white tea could possibly beat. Sadly, Americans are addicted to sugar products like Coca-cola, so it's impossible to get bottled unsweetened green tea.
In Japan, any convenience store will have at least a half-dozen brands of green tea, all unsweetened, and all delicious. Ironically, my favorite, ã¯ã˜ã‚ (Hajime-cha) is made by Coca-Cola Japan.