Combine the flour, sugar, baking soda, cinnamon, nutmeg, and salt in a an un-greased 8×8 square or a 9-inch round baking pan. You can also use a 9-inch cast-iron skillet.
Poke 3 holes into the flour mixture. In the first hole, pour the vinegar. In the second hole, pour the vanilla. In the third hole, pour the oil.
Pour the water into the pan and stir the batter until well blended. Stir in the apples and pecans.
Place in the oven and bake for 45 minutes or until an inserted knife comes out clean. Sprinkle the top with powdered sugar before serving.