water to fill the pot and completely cover the corn
Place the corn cobs in a big stock pot and cover with water. Bring to a boil and then reduce the heat to simmer for at least at hour. (You can allow this to simmer longer, although I didn't notice a huge difference in the results when I let it simmer for 3-4 hours.) Remove the corn cobs and use the stock immediately or let it cool and store in the refrigerator for a couple weeks. The stock can also be frozen for later use.
Kitchen Tip: How To Make Corn Stock https://barefeetinthekitchen.com/how-to-make-corn-stock/