How do I go about breeding soil based organisms (SBO) as probiotics?

I'm looking for a simple method that does not involve specialised equipment. I was thinking about using Fulmic and Humic acids from oxidised brown coal and perhaps adding molasses.

And does anyone know a good source with a wide range of SBOs?

The best I've found has perhaps 30 species but I was hoping to find something in the order of 100+ species. Obviously the more, the merrier.

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