In a medium size bowl mix the corn-flour and salt. Slowly add the water and knead to form a uniform mixture. If the dough feels dry, add more water, little by little, spoon by spoon, until the dough is soft and manageable, like play dough. It doesn't have to be sticky. Depending on the humidity of your local city, you will need to add about 2 more tablespoons of water to the dough, and also keep a small bowl with water to moist the dough as needed. This dough tends to dry,