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You probably could. I would still use a PF tek to do that if you don't have access to a pressure cooker, it's the best way to germinate spores and get fruits without losing everything to contamination.
But basically you could probably take Cheerios and throw them in a coffee grinder. And use them as a substitute for the brown rice flour.
I think I have a pressure cooker. What’s the difference in method recommended? Could probably get brown rice flour tbh.
Pressure cookers also have a learning curve. With that method you use hydrated and sterilized grains and really should know culture work to do it too.
For personal use the pf tek with BRF and vermiculate works well. You can steam pastuirze them rather than sterilize. And can inoculate straight from a spore syringe. If you live in the United States I'd suggest going through spore works. Their syringes are very clean. It doesn't produce a lot but it produces enough.
It's the same idea as the Uncle Ben's Tek. But it produces better and more consistently, with only a little bit more work.
Ty <3
Happy to help! :)