I already responded in your other thread.
Problem is, horses need roughage. For their stomachs. They're made to eat constantly, so the stomach produces acid constantly. Empty stomach....the acids start eating the stomach lining, which will cause ulcers. Therefore, hay is essential for a healthy horse. You can stretch your hay with some alfalfa cubes or pellets, together with feed quality straw. But that alone is not ideal, the cubes are more expensive than baled hay.
Don't know where you're at and what the drought situation is. But waiting it out until spring and looking around for hay growers in the meantime would be your best bet.