I have iced sweet tea in my fridge at all times. Can't live without it.
Using a tea kettle, heat water until the whistle. Don't boil - especially if you have hard water. It gives a funky taste.
Pour water into a 1 gallon pitcher and drop in 1 family size tea bag.
Let it steep for 30 minutes or so.
Sweeten to taste. I use either 1 cup of sugar or artificial sweetener to equal that.
Fill the jug the rest of the way up with cold water and stick in the fridge.
In my house, we make at least 2 gallons every day. More if my Dad stops by.