Combine 2/3 cup of water with the sugar in a small saucepan and bring to a boil. Stir to dissolve the sugar.
Combine the sugar-water with the lemon juice and add the 6 cups cold water. Stir to combine. Add green food coloring to achieve desired color.
Serve immediately over ice garnished with a lemon slice or store in the refrigerator until ready to use.
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