Long John Silver's Deep Fried Fish

1 pound fish fillets
¾ cups Flour
2 tablespoons cornstarch
¼ teaspoons baking soda
¼ teaspoon baking powder
¼ teaspoon salt
¾ cups water

Combine all dry ingredients and sift into a medium sized bowl
Add water and mix thoroughly.
Dip fish in batter until completely covered-let excess batter drip off.
Deep fry at 375 degrees until golden brown.