Fruity green tea is surprisingly easy to make and keeps you hydrated all day long. In a saucepan, bring the water to a boil. Remove from heat and add the green tea bags. Let the tea steep for 3-4 minutes. Meanwhile, muddle the mixed berries (such as strawberries, raspberries, and blueberries) in a separate bowl to release their juices. Remove the tea bags and allow the tea to cool slightly. Add the brewed tea and muddled berries in a jug. Refrigerate until chilled. Serve over ice cubes with lemon slices and sweeten to taste.