So you are just using the rice packet without any additional stuff? Never heard of that method, but I might try it.
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Yeah it's call broke boi tek or uncle ben's tek. The /r/unclebens subreddit is dedicated to just that method and has some guides, or you can just search the web for instructions. I'm sure the shroomery has plenty of guides too. The theory is simply that brown microwave rice packets have good nutrients, are sterile, and have the right amount of water content. A lot of people complain that the water content is actually too high so you need to be sure not to add too much extra liquid via syringe when inoculating, but it's meant to work out anyway.