In a large resealable plastic bag, combine the flour, salt and pepper. In a shallow dish, beat eggs and water. Place bread crumbs in another shallow dish. Add mushrooms to the flour mixture; seal bag and shake to coat. Dip in egg mixture, then coat with bread crumbs. Let stand for 10 minutes., In a deep saucepan, electric skillet or deep-fat fryer, heat oil to 375degrees. Fry mushrooms, six to eight at a time, for 1-2 minutes or until golden brown, turning occasionally. Drain on paper towels., Pour spaghetti sauce into an ungreased 13x9-in. baking dish. Top with the mushrooms. Sprinkle with cheeses. Bake, uncovered, at 350degrees for 4-6 minutes or until cheese is melted.