You'll need an extremely clean glass or plastic jug/container with a tight-fitting cap. Place the tea leaves in the jug/container and fill with clean, cool water, and cover tightly. (Please see Notes, below, for the amount of tea to use.)
Leave the jug/container in the refrigerator (in the door is best) or in a cool dark dry place in your home for the recommended steeping time (please see Notes, below). Do not stir or agitate.
When the steeping time is complete, strain the tea as thoroughly as possible, by pouring it through an extremely fine mesh filter, or even a coffee filter or paper towel. Filter your tea as many times as you need until you cannot see any tea solids (dust-like particles of tea leaves) in it at all.
Return the liquor (the beverage) to a clean jug/container, and add fresh cold water to get it back up to 2 quarts (replacing the water lost to the tea leaves). Refrigerate for at least 1 hour, serve over ice. To sweeten your tea, use simple syrup -- sugar doesn't work as well.
Protip: pour some iced tea into an ice cube tray and make 'iced tea cubes'. This way your drink won't get weak as the ice melts. You can also get creative and make Rosehip ice cubes for Lychee iced tea -- go crazy!