Turkey Chow Mein Casserole

2 C Chow Mein noodles
1 can cream of mushroom soup
1/4 C water
2 C cooked turkey, cubed
1/4 C chopped onion (red onion adds a little color)
1 C chopped celery
1 can sliced mushrooms, drained
1 small can sliced water chestnuts, drained
Topping:  Crushed potato chips, sliced almonds or chopped cashews.

Put Chow Mein noodles in the bottom of a greased two-quart casserole. Combine all remaining ingredients and spread over the noodles. Bake uncovered at 350 degrees for 30 minutes. Remove from oven and add desired topping.  Bake for ten minutes longer.