Remove the stems from apples, and insert food-safe branches or craft sticks. Microwave caramels, vanilla extract, and water until melted, stirring every 30 seconds. Quickly dip or drizzle apples with caramel mixture; roll or sprinkle with crushed peanut brittle or toasted pecans, if desired. Stand apples on lightly greased wax paper, and chill 15 minutes before serving.