Mix masa, cornmeal, and salt in a medium-size bowl.
Add 1/2 cup water. Stir and pull mixture together in a dough. Add more water if needed until dough is holding together but not overly wet. It will slightly sticky.
Heat a skillet or griddle over medium-high heat.
Divide dough into 10 pieces and roll into balls.
Roll out dough to about an 1/8" thick, between two sheets of plastic or parchment paper or use a tortilla press.
Cook tortilla in the hot skillet for about 30 seconds on each side. Remove and keep warm in a towel. Use as desired.
Notes
It is easier to make homemade corn tortillas using a tortilla press but you can roll them out.