In a large pot boil potatoes for 10 mins. Drain & set aside. Cook bacon until crisp. Drain fat and place on paper towel over plate to drain more. Add onion & celery to bacon pan over medium high heat until tender about 5 mins. To the large potato pan add milk, water, bullion, salt and pepper. Cook over medium-high heat until very hot, about 8 mins, stirring often. Do not boil. In small heavy saucepan melt butter and add flour; mix well. Cook over medium heat until mixture bubbles, stirring 2-3 mins. Stir into soup slowly and stir until thickened. Stir in parsley, reserved potatoes and cream. Garnish with cheese, bacon, onions