How much grow big for a nitrogen deficiency

One of my plants is having a nitrogen deficiency. I've never gave nutes they've been feeding on the ffof. So how many tsp of grow big should I give it for it's first time of nutes to cure the problem? Also should I use ro water?

No more than the recommended dose, wouldn't want to burn it, that would be worse... Maybe even start with half dose and if the problem precedes then up it bit by bit every week... good luck hope she recovers!

No don't use water just mix it in with a bottle of mountain dew, lmbo just giving ya some shiit be easy holmes

What I meant was tap water or ro water / thanks though

Yeah I know was just giving you a hard time, sorry if I offended you lol but yes I'd say use RO unless your tap water comes from a tested well, it could have impurities and chlorine from city supply