Boil water in kettle on stovetop (alternatively, you can boil in electric kettle or in microwave). Pour water into heat-proof cup and add teabag. Let steep 5-10 minutes minutes.
Remove tea bag, squeeze to extract any liquid, and refrigerate tea for at least 30 minutes to cool.
Add ice to a shaker or large mason jar. Add brewed green tea, 3 oz peach juice, and 3 oz. lemonade. Shake well to combine and pour entire contents of shaker into a cup. Alternatively, you can pour tea, peach juice, and lemonade into an ice filled cup and stir.
Taste and add more peach juice or lemonade if you desire a sweeter drink! If drink is too sweet for you, brew more time or stir in some water.