In a medium saucepan, bring the 4 cups water to a boil. Add the tea bags, remove from the heat, cover, and steep for 15 minutes. Meanwhile, put the sugar and limeade concentrate in a 2-quart heatproof container (like a large Pyrex liquid measure). When the tea is ready, remove the tea bags (don’t squeeze them) and add the tea to the limeade mixture, stirring to combine. Stir in the 3 cups cold water, let cool to room temperature, and then refrigerate until ready to serve.
To serve, pour 1-1/2 ounces of the whiskey into each 12-ounce glass. Add 1 cup of the limeade-tea mixture to each glass. Stir to combine. Add ice and garnish with the lime wedges, if you like.
Photo: Scott Phillips