In a 100 square foot growing area, most growers are able to produce about 400 pounds of mushrooms within a growing cycle.
These would include caffeinated beverages such as soda, coffee, and green tea. Some people prefer the sterilized coffee grounds or sawdust compared to straw. https://bbarlock.com/index.php/How_To_Plant_Mushrooms_-_Increase_Your_Own_Oyster_Mushrooms_Indoors