Chicken and elbows

Ingredients

• 4 large chicken breast boneless and skinless
• 2 1/2 quart water
• 16 oz chicken broth
• 1 tsp ground black pepper
• 1 tsp celery salt
• 1 tsp salt
• 2 tsp granulated garlic powder
• 1 lb elbow pasta
• 1 tsp kicthen bouquet
• 1 stick margarine
• 1/2 cup cornstarch
• 1/2 cup cold tap water