I'm not convinced by the wisdom that a hot cup of tea cools you down in hot weather. This is a genuinely refreshing way to get your tea fix.
5 cups water
2 tea bags
1 pinch bicarbonate of soda
1 cup sugar
Boil the kettle and make 2 cups of weak tea (brewed for about a minute). Add a pinch of bicarbonate of soda and dissolve the sugar in the tea. Add 3 cups of cold water and chill. Serve over ice. You can vary the iced tea by using different types of tea or adding lemon.