Preheat oven to 4250 F.
Beat egg, milk, and water together until well blended. Combine dry ingredients in another bowl and stir together. Then stir into egg-corn mixture, just until batter is blended.
Fill greased muffin cups about 1/2 to 2/3 full. Bake about 15 minutes -- until center of muffins pass the "clean knife" test.