How much lemon is bad for you?

ive been drinking lemon water a lot the past two days, and was wondering how much is bad for me. I've only been using about 3 quarters of a lemon, and I don't think thats too much, but I read that too much lemon acids can be dangerous. Is 3 quarters of a lemon too much?
Update: btw, I meant 3 quarters of a lemon per day, not per drink.
8 answers 8