Mix flour and water together (start with 2/3 cup). Knead with your hands until it holds together, adding more water as necessary. Turn on to a floured board and knead for about 10 minutes. Shape into a ball and place in a bowl. Cover with a damp towel and let rest for 45 minutes. Divide dough into 12 equal portions. Roll out one at a time on a lightly floured board, until they are about 6 inches in diameter. Stack circles between sheets of waxed paper. Cook on a non-stick griddle or frying pan until top changes color. Press down with spatula. When bottom is lightly browned, about 2 to 2 1/2 minutes, turn over and cook until the other side is browned. Serve hot.