American raised in the Southeast checking in: put tea bags in kettle of water on stove, heat until the kettle whistles, pour into 1 gallon container with sugar, mix while still hot, and finally place in refrigerator for storage.
When its 78 in February and won't cool down until November, having a nice, cold glass of sweet tea is lovely.
Its great! I saw the little "try over ice!" on the box and never looked back. I reccomend an extra tea bag and steeping a bit longer, then pouring over more ice than you think you need. You want to flash cool it. I dont add anything to preserve the strong flavor, but I know many throw in some sugar.