This is from the first grow I did, PF tek style but with a few updates. I did a couple monotub grows a year later that went great but I can't for the life of me find any pics.
The white pebbles are perlite and the cake is mostly rice bran meal and fine vermiculite, with a little coffee and gypsum.
If you really don't have access to spores (they're legal to buy in the US, also people do spore print giveaways and trades all the time), then it's possible to clone a 'shroom from actual dried tissue or from old spores and I believe all the info you'd need you could find online. It would involve rehydrating the sample and using antibiotic agar and would be a pain in the ass and take a while, but as a last resort it's definitely possible!