i use miracle grow for veg and baby bio when they start budding, they're not top of the line by any means but they do the job.
as for soil i use the dirt out in my back yard mixed with a couple handfulls of pebbles and some organic compost.
it's about a 2:1 ratio soil:compost but i just chuck it all in a bucket tbh. i'm not the most careful nor accomplished gardener round here, but i do love my lowryders and they love me.
good luck