If I drink at least eight cups of water every day and drink nothing else, what benefits would it have and would it help my acne?

I have acne and have tried everything to get rid of it; nothing worked! All the doctors are giving me these medications and creams that take forever to work and usually make no difference. If so, the difference is extremely slow and doesn’t show until after three months. Online everyone is saying drink a bunch of water and I’m kind of skeptical. So I just started: I am going to try to drink only water (at least eight cups a day) for a week or two. How will it help me, besides my skin? And how long will it be until my acne starts clearing up by drinking only water and a lot of it?