Combine noodles, cream of chicken soup. onion soup mix, gravy and water and mix well. Bake at 350 for 1 hour. Stir well before adding peas to determine if more water is necessary. For 12oz. of peas add about 6 more oz. water and after mixing well bake an additional 15-20 minutes until peas are cooked and casserole is rewarmed.