What substrate to use for growing zoomleyz

So i get that you don't need much to grow these things, but I'm looking for something clean smelling. Rather than grow on shit, something more sanitary would make my week. Other than that , I have no clue where to start. Small grow bags with air filters are cheap on their own. Any advice would be greatly appreciated.

Pasteurized Horse poo does not stink, even fresh hpoo barely has a smell...your thinking cow poo which needs to be leeched and drained before using with any fungi or whatever....

its pretty easy u just need details and sterility...and a pressure cooker

wild bird seed that doesnt contain cracked corn or sunflower seeds. If it has sunflower seeds, when you rinse the seeds the sf seeds will float to the top....just sift them out. Look up the rez-effect, and it will tell you anything you wanna know. Shroomtalk is a kick ass site for anything on shrooms. Good luck!