Organic soil with miracle grow in a bag. I water once a week with urine diluted with water and fish fert. The rest just water. Fish fertilizer is a liquid it calls for 3teaspoons per gal. I use 4 a gal. Once a week.
I know what fish liquid is, as I have used it before , but only in the beginning. Just till plant were a month old or so. Then I went with fox farms ferts. Very good as I might add. I run with a 12-6-6. Plant will need more ferts as they get bigger. Dose the mg soil have time release nutes. I would Stay away from using urine. I know it might work but not needed with fish liquid. You also might wanna look at getting some cal/mag. I also use more than one ferts at a time. Get some good ferts as soon as you can. Check out my journal if you would like.