Crawfish Etouffee

Name: Crawfish Etouffee
Ingredients: 2 sticks Butter, Unsalted; ½ cups Flour; 3 cups Yellow Onion, Finely Chopped; 2 cups Celery Finely Chopped; 1 cup Green Bell Pepper, Chopped; 1 Tablespoon Garlic, Minced; 2 cups Chicken Stock; 1 can (10 Oz. Size) Cream Of Mushroom Soup; 1 can Very Cold Water (use Soup Can); 1 can (10 Oz. Size) Diced Tomatoes With Green Chilies; 3 teaspoons Gumbo File; 1 Tablespoon Tony Chachere's Original Creole Seasoning; 1 pound Crawfish Tails; Salt And Pepper; 3 cups White Rice, Cooked