The only way you can make an Arnold Palmer better than Arizona's is to make it yourself.
First, you need to make the simple syrup. What you'll need:
1 cup sugar
1 cup water
Into a medium saucepan, place both ingredients, and bring to a boil. Simmer until the sugar has completely dissolved. Remove from the heat and allow to cool. Yields about 1 cup.
Next, prepare the tea.
4 heaping teaspoons or 4 teabags of your favorite black tea (Ceylon or a breakfast blend would be a good choice)
32 ounces boiling water
Place the tea leaves or bag in a large teapot and brew with the hot water for about 3-5 minutes.
1 cup freshly-squeezed lemon juice
Zest from one lemon
2 cups ice cubes, plus additional cubes for serving
While the tea brews, place the lemon juice, zest and iced cubes in a blender and hit the puree button. (This is noisy but thorough!) The end result is nearly a sorbet.
To serve, place 3-4 ice cubes in a large glass, top with the tea to about three-fourths full. Add about ¼ cup pureed lemonade and stir. Serve immediately. Yield: 4 servings.
I would recommend teas from either Adagio Teas or Teavana as I've found them to be of the best quality. No other tea retailer has yet to come close to either, especially Adagio.