Combine corn meal, flour, chili powder, salt, garlic powder and pepper in a shallow bowl or a baking pan. In medium bowl, beat egg and water with a fork until well blended. Dip fish fillet in corn meal mixture, coating all sides of fillet. Then dip in egg mixture. Dip in corn meal mixture again. Heat oil in large skillet over medium heat. Fry coated fish 2 to 3 minutes per side, or until fish flakes easily with a fork.