Grain needs to be fresh and dried.
It can be purchased at health food stores and must contain no fungicides. Approximately 8 ounces of grain for each quart jar will be required Seven ounces of bottled water for each quart jar. Quart Mason jars, the number needed will be determined by the amount of mushroom desired. You will need to punch a hole in the top of the lid, do this with the screwdriver and the hammer. Now fill the hole with a cotton ball, this process allows for air exchange, without allowing harmful bacteria into the jar.