In a heavy pot cook bacon with onion, parsley, and black pepper for about 5 minutes. Add the 1/2 bay leaf, minced celery, and minced green pepper; cook for 15 minutes. Add juice from minced clams, 1 eight-ounce bottle of clam juice, reserved liquid from tomatoes, diced potatoes and water; simmer for 25 minutes longer. Add the clams, tomatoes and second eight-ounce bottle of clam juice; correct seasoning.
Add butter; sprinkle top with parsley. Serve with crusty garlic bread or oyster crackers.