1. Combine water and sugar in a small saucepan; cook over high heat, stirring until sugar dissolves. Remove from heat. Stir in coffee granules; chill.
2. Combine chilled coffee mixture, milk, and creamer in a shallow container. Cover and freeze 8 hours or until solid.
3. Let stand 5 minutes, if needed, to soften slightly. Break frozen mixture into chunks. Process in a blender or food processor until smooth, stopping to scrape down sides.