It's been a while since I've had tea and it's not fancy or anything but what I did was I would start off with either an unsweetened green or black tea bag (just whatever I had at the time) and steep it in twice as much water that was recommended on the box. After I removed the tea bag, I would then add a lemonade drink mix and either 1 packet of sugar for green tea or 2 packets of sugar for black tea.

I don't remember any specific combinations of brands but I think I remember sweeter lemonades working better with green tea and tart lemonades working better with black tea. Just avoid True Lemon, I haven't tried their other drink mixes but I remember the regular lemonade drink mix being terrible in tea.