Brew the tea bag in about 8 ounces of hot water, and let it cool to room temperature.
Fill a large pitcher (60 ounce or larger) with the cooled tea, cranberry juice and lemon juice. Fill the remainder of the pitcher with water, and refrigerate.
Drink the entire pitcher throughout the day for up to 7 days (you will make a new pitcher every day). I like to make mine the night before so that it's chilled and ready to go the next morning. I also like to add in a few fresh cranberries and lemon slices because it makes it feel like a treat!