Place the lemon zests in a pitcher, and save the lemons for another use. Pour the alcohol over the zest and cover with plastic wrap. Steep for 5-7 days at room temperature. In a large saucepan over medium heat, stir the water and sugar until the sugar dissolves. Cool completely. Strain the alcohol through a mesh strainer, and discard the zests. Pour the simple syrup over the alcohol Cover and let stand at room temperature overnight. Store in a sealed container in the refrigerator or freezer until ready to serve.