in a medium bowl, combine dry ingredients. stir well to break up lumps. add 2 tablespoons of oil, milk, water and egg. stir vigorously until just beaten about 30 seconds. do not overbeat. place remaining 3 tablespoons of oil, in a 6 inch cast iron skillet. preheat pan in 425 degree oven for 2 minutes. carefully remove hot skillet from oven and pour in cornbread batter. bake at 425 until done and golden brown about 18 minutes. then place under broiler for 2 minutes until top is dark golden brown. serve immediately.