system
Given the following post, respond as if you're commenting on Reddit:
human
How much water do we absorb through our skin? If I were to sit in a bathtub during a hangover, would I eventually become hydrated?

I heard a story of a girl dying from alcohol poisoning because she filled up her bathtub with vodka (I highly doubt this actually happened.) Anyways, I was wondering if its possible we absorb a significant amount of water through our skin?
gpt
It is not possible to absorb or lose a significant amount of water through your skin. It is a largely impermeable membrane. The exception is via your sweat glands, which are one-way. 

It is possible to die from dehydration due to this. Wrestlers and fighters who have to make weight before a fight use this mechanism. They sit in a tub of hot water, and their body tries to cool them down via sweating. As sweat works to cool by evaporation, and you can't evaporate under water, the body increases sweat production when it's sweating and not cooling down. This rapidly purges water from the body, and it's possible to lose enough water in this way that you die. Under medical supervision, you can purge in the ballpark of 10% of your body weight in this manner and still be ok. 

Your intestines are the opposite - they absorb water quite readily. There have been recent cases of people funneling booze into their asses to get drunk via this method. There are also cases where people stuck on islands without drinkable water have funneled semi-salty, contaminated water up their asses as well. Again, the intestines are good at absorbing liquids, while keeping out bacteria and other chemicals the body identifies as waste.