To transform your hot tea collection into refreshing iced tea, brew the tea as usual, then chill it in the fridge. For every cup of filtered water, use one teabag (or two teaspoons loose-leaf) of any black, green, white, or herbal tea variety. Remove the teabags after three to five minutes of brewing, and allow the tea to come to room temperature before popping it in the fridge. Alternatively, for a fast iced tea, make a "condensed" tea by brewing two or three teabags per cup of filtered water. Then pour the hot tea directly over ice. Unsweetened tea will generally last about three days in the fridge — that is, if you don't drink it before then! How often do you make your own iced tea?
Source: Flickr User Pen Waggener