In a large bowl, combine flour and salt. Stir in water and oil. Turn onto a floured surface; knead 10-12 times, adding a little flour or water if needed to achieve a smooth dough. Let rest for 10 minutes., Divide dough into 8 portions. On a lightly floured surface, roll each portion into a 7-in. circle., In a greased cast-iron or other heavy skillet, cook tortillas over medium heat until lightly browned, 1 minute on each side. Serve warm.