Place oatmeal, cereal and pecans in a large bowl and mix lightly. Set aside. In another bowl, cream margarine and sugars together at medium speed until light and fluffy. Add eggs whites, vanilla and water, and mix at medium speed
for 1 minute, scraping down the bowl before and after adding egg whites, vanilla and water. Stir flour, baking powder, baking soda and salt together and add to creamed mixture and mix at medium speed only until oatmeal is blended into dough. Drop by heaping tablespoonfuls onto a cookie sheet that has been prepared with non-stick cooking spray or lined with aluminum
foil.
Bake at 375 degrees F for about 12 minutes, then remove cookies to a wire rack and cool to room temperature.