Yes, do use Luzianne if you want authentic sweet tea.
For a gallon, boil 3 quarts water. Add 3 family-size tea bags, then 2 cups sugar. Let it sit 20 minutes. Pour into your pitcher and fill with cold water/ice until it reaches a gallon.
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The alternate "recipe" is: drive to nearest
Lee's Chicken. Buy 1 gallon sweet tea. Serve over ice.