I only brew this cold so I can make my own version of the shaken iced tea lemonade from Starbucks, which I once bought multiple times a day on a very hot, humid trip to the East Coast one August. The tea balances out the sourness of the lemonade very well. It’s the perfect refreshing summer drink! I use 1 bag per 8 oz of water and let it steep in the glass or pitcher for awhile, then I add equal parts lemonade and some ice. It’s not rocket science, you can play with the ratios to your taste. No sweetener needed!
The key to this is finding a good quality lemonade. I believe Starbucks uses their own exclusive kind. I use Simply Lemonade since it’s one of the more “natural” options at my grocery store and it has good kind of homemade flavor on its own.