A recipe for Potato Soup is listed below:
 3 1/2 cups of peeled and diced potatoes
 1/3 cup finely chopped onion
 3 1/4 cup water
 2 cups of milk
 1/2 teaspoon salt
 5 tablespoons of butter
 1/3 cup diced celery
 3/4 cup of diced ham
 2 tablespoons of chicken bouillon granules
 1 tablespoon ground black pepper
 5 tablespoons of all purpose flour.
 You accidently use 5 cups of potatoes. Approximately how many cups of water will you need for 5 cups of potatoes?