Preheat oven to 350°F. Grease a 9x13-inch baking dish.
In a large bowl, mix together cooked ground beef, soups, onion, celery, water chestnuts, rice, water and soy sauce.
Transfer mixture to prepared baking dish. Cover tightly with foil.
Bake for 1 hour 20 minutes until bubbly. Remove foil.
Sprinkle chow mein noodles evenly over the top. Bake uncovered for 10 more minutes.
Let sit for 5 minutes before serving. Enjoy!