Rinse cranberries and pour into a large saucepan. Add water and cook on medium high heat until cranberries come to a simmer. Cranberries will begin to pop open and make the most delicious sound. Add sugars and apples and simmer for 5-7 more minutes or until apples soften. You want them to be softened, but not mushy. Remove from heat and stir in roasted walnuts. Refrigerate and serve cooled. Cranberry sauce sets up and gels more as it cools.