Mix together masa, water and salt until a soft dough forms. Add in additional water by the tablespoonful if dough seems too dry. Knead on a lightly floured surface until dough is softened, about 5 minutes.
Make small balls out of the dough. 1-inch for small (think large marble,) 2-inch for regular size (think walnut,) 3-inch for large sopes (think golf ball.)