Dont get me wrong, I LOVE beer... I mean I would drink it all day everyday if it had no adverse effects... but..
I read James Browns biography and he was talking about back in his earlier days playing gigs, he would drink beer after shows thinking it would rehydrate him (you know how bad he sweats, and he just thought it was liquid and it was good so...) but he ended up in the hospital as a result of this miscalculation.
This might work with 1 beer followed by water... but in my never ending search to justify beer drinking and to prove it as the true nectar of the gods I have seen a lot of evidence that goes against this as a hydration method. I am sure it works under certain circumstances but misinterpreting this info could result in negative effects.
I also knew a guy a that developed kidney stones at a young age by drinking iced tea to rehydrate after long bouts of exercise ...
Hate to burst the bubble but I had to speak the truth as I know it, water... the best hydration method next to an IV.