Bring water and cranberries to a boil in a large pot. Reduce heat, and simmer for 15 minutes. Strain into a large punch bowl, pressing gently on solids. Discard solids. Add granulated sugar, stirring until sugar dissolves. Cover, and refrigerate for up to 1 day.
Thread several cranberries onto each of 12 small skewers. Brush with egg white, and sprinkle with superfine sugar. Let dry on a nonstick baking mat.
Add club soda, and vodka if using, to bowl. Top with sherbet, and serve with cranberry skewers.
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