A mix of 1 part of the best soil mix you can get your hands on, 1 part big perlite, 1 part good compost + 1 Cup balanced Bat Guano or slow release fertilizer pellets (organic) per 50L of mix in a big pot (10+ gallons) shouldn't need much additional nutrients.
The bigger the pot the less nutrients it would require. Don't forget to mulch your pots.
I got a friend who is using a 90L plastic tote with 4 plants in each and it doesn't seem like he would need anything else than water for the whole cycle. Maybe a tiny bit of guano + wood ash in flowering to pump the flowers.
And you can also add compost tea (you can just put the compost in a sock and shake it well in a bucket of water for an instant compost tea) for beneficial microbes. ONLY USE DIRECTLY AFTER PREPARATION!
If you want to go to the bottled fertilizers area I use the House and Garden Coco A+B (~70USD per 5 liter of each, you use up to 2ml/L) and Atami Bloombastic (~130USD per 1.25 liter, you use around 1ml/L in the last 5 weeks of flowering only) and I'm happy with it. (you can check the results here:
https://www.rollitup.org/t/yekke-seeds-golden-diesel-breeding-log.852676/)
I'm using coco in 3.6L pots with a drip system. I rarely use anything beside these products and a pH down. (you could easily use cheap vinegar)
However, for successfully using these fertilizers you need a good pH and EC meters. That's some money as well.
The fertilizers in the amounts given above should be enough for quite a few cycles if you'r running one light.
