system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If I was dehydrated and there was only alcohol to drink, would drinking it make me even more dehydrated?
gpt
Beer? Compared to drinking nothing, it would often hydrate you. Especially light beer. There is after all a little bit of alcohol (5% or less, in most beers) and the rest **is** (mostly) water. 

Alcohol itself is counterproductive and is not in *any* way a water substitute. So 100% alcohol (or very near it) could not possibly provide any benefit.

As the strength increases, at some point there is a crossover where dehydrating effects outweigh the water contained in the beverage. I’m not sure where this point is, but it would be different depending on the person and circumstances.