Put flour into a bowl. Make a hole in the center and put in the baking powder, salt and oil. Add a tablespoon or two of water and stir vigorously.
If the dough won't stick together add more water, by tablespoons. You don't want the dough to become a batter.
Divide the dough into balls about as big as a tangerine. Roll or pat (or use a tortilla press). If you haven't got an electric press you'll need to put each tortilla on a hot grill just until lightly toasted on each side.
Cover with a cloth or slip into a heavy duty plastic bag to keep.