help with nutrients

so i've decided to grow some easy bud by royal queen seeds http://www.royalqueenseeds.com/124-easy-bud.html
she grows to about 60 cm but im growing her in a small tub ive made and was wondering how small can the pot be in order
for a plant to grow, the tub can fit 900ml in it.

Your topic was about nutes but your question is about container size. 1 liter is not big enough if you don't know how to grow well, it will be a struggle for you. You really should have at least a 6 liter container to ensure a good root system and easier care of the plant it will give you a better yield also.
Welcome to RIU and good luck

I figure about 3.5 - 4 liters per month of growth, so for an 8 week plant with 4 week veg = around a 10 liter pot is good.