1. Stir together first 3 ingredients in a large pitcher. Serve over ice. Garnish, if desired.
Slushy Red Roosters: Substitute 1 (12-oz.) can frozen orange juice concentrate, thawed, for 3 cups orange juice. Stir together cranberry juice cocktail, orange juice concentrate, vodka, and 4 1/2 cups water. Place 1 (1-gal.) zip-top plastic freezer bag inside another 1-gal. zip-top plastic freezer bag. Pour about 4 cups cranberry mixture into inside bag. Seal both bags. Repeat procedure with remaining cranberry mixture. (Double bagging is a precaution to avoid spills.) Freeze bags 24 hours. Remove bags from freezer; let stand 5 minutes. Process cranberry mixture, 1 bag at a time, in a blender or food processor until desired consistency. Pour into glasses. Serve immediately. Makes 3 qt. Prep: 10 min., Freeze: 24 hr., Stand: 5 min.