Nothing in particular, I dont care what the brand is. Just any cheap organic soil that I can buy in store will do. Any recommendations from that site I linked you?
I would like to use some fox farm or whatever, but that shits expensive
That sites down at the moment. I'll look later.
I use 60% Pro-Mix HP+Myco, 20% Kellogg Patio Plus (potting mix), 20% perlite. I add 1 to 1.5 Tbsp dolomite lime (Hy-Yield Agricultural Lime).
That will make 3 cu. ft (with a lot of Kellogg and perlite remaining). That's 23 gallons of soil. You can substitute the Pro-Mix with a generic peat product. Add 30% more dolomite and 50% more perlite. (Maybe add Xtreme Mykos if you want to have that too.).
It's a very light, airy soil. Almost soilless (which is what Pro-Mix is by itself). It works great for me.
I see someone is recommending MiracleGro's organic potting mix. I don't want to contradict anyone's experience. But, MG has a very bad reputation. The nutes are ok (because NPK is NPK). But, the soils seem to be universally disliked (except someone just proved me wrong. So, you'll need to give that careful thought. Ask around, etc.).
A lot of people use FF soils. I agree with the MG guy, my impression is that they're heavy. I haven't used them.
Just be careful. Soil can make or break what you do. It should be light, well drained. I would add a lot of perlite to whatever you use.