Let tea steep for at about 5 mins so it's nice and strong. After tea is cool, mix together the remaining ingredients. Add more sugar and/or lemon juice to suit your taste. Some flavors may need more juice concentrate. You probably won't be able to perfectly match your favorite flavors, but you'll save a lot of money and you may create a new favorite. Also, you can make it exactly as sweet or tart as you like and you have a use for those 16 oz bottles (recycling at its best).