Dude I live in the sticks in Arkansas & even my local grocery store has bagged compost, potting soil & basic ferts.
This is a Weed we're growing. I grow mine in the ground, with some chicken shit, cow shit and later I'll add bat guano. You don't need High Dollar ferts. Keep it basic.
You can make a decent mix, with some bagged composted cow manure, some peat moss and potting soil. Don't get that shit with ferts already in it. It will say something about it feeds for three months. Pertilite is good to.
Mix it up in equal portions, wet it, pour some water thru it and make sure it drains OK. It should drip, not run. No exact science here. It's a Weed, just give it a place to spread its roots, some water, sunlight and some basic ferts, it will do the rest.