Wash chicken and pat dry. Place in slow cooker. Drizzle butter and sprinkle salt, pepper & dry salad dressing mix on each layer. Cover and cook in crockpot on low for 5-6 hours. About 45 minutes before serving: mix soup, cream cheese, water & onion in small saucepan. Cook & stir until smooth and bubbly. Pour over chicken. Cover & continue to cook for 30 minutes. Serve over rice/noodles.