Long John Silvers Batter - 3/4 cup flour, 2 T. cornstarch, 1/4 t. baking soda, 1/4 t. baking powder, 1/4 t. salt, 3/4 cup water.   Sift dry ingredients. Add water and mix well. Use to coat fish or chicken filets. Cover the fish completely. Deep fry until a nice golden color.