Cook rice in the water with salt. Spread the cooked rice on a kneading plate or thali. Knead the rice with the rice flour, adding a little at a time. Make a dough. Roll into a little flour to prevent sticking. Make small balls and flatten in a chapatti press between two plastic sheets wiped with a little oil or rice powder to prevent sticking. remove the roti, put it in a hot Tawa for a minute. turn the roti over and keep for a little longer. Turn it over again, remove and put the roti on direct heat/flame. The roti will puff out well. Careful not to burn.