Well, this is a new phrase....and since the person used it twice, I think it's a legitimate mistake on his or her part, not just a momentary slip of the person's grammar skills.
I've heard of asking stuff like "What all do I need?" which also isn't really proper grammar--but it's colloquial, and although it sounds a bit awkward, it's a phrase we all understand when we hear it...so it doesn't matter as much that it's not the best grammar. But "what I all need" is a new one...and a particularly screwy one. You, question-asker, are one person. You aren't an "all." I can understand asking "What do we all need..." (that would be absolutely fine, grammar-wise!), but this "I all" stuff is most definitely not fine. This Grammarphile does not approve!
Also, I'm not sure the person who answered the question-asker's question could have given a more bland answer. Had I been the one to answer that question, I'd have said "Glitter, fun eye makeup, dark nail polish...and more glitter, dammit!!!"