There is not going to be an exact answer to this because people vary and their rate of water loss will vary with circumstances and their alcohol metabolism will vary and how quickly it is absorbed varies etc. However, in general it can be said that wine and stronger will tend to dehydrate you while beer (of average or less strength) will hydrate you. I know this through much personal experience. Doctors always play it safe and say don't drink alcohol when you are out on hot days; but, the reality is that beer is an excellent beverage and the water in it outweighs the alcohol.
The percentage of alcohol in beer runs 4% to 6% for most beers. For most wines the percentage of alcohol is 8% to 10%. So, to answer your question as best as you are likely to get without a research grant, it's about 5%.
That works out to 19 parts water to one part alcohol. Again, this can vary by person and by circumstances. Drinking the alcohol in a form other than beer is more likely to be unhealthy because the carbonation and the other constituents of beer (lots of complex carbohydrates in good beer) make it a drink that is hard to drink too much too fast.
I would add that drinking alcoholic beverages without added sugar (nothing red or purple) will help. This does not exempt you from the aforementioned 1-to-1 ratio. Try vodka soda with a lime.
Alcohol dehydrates the body and draws from it vitamins and minerals. Drink water, soda or better yet -fitness water such as Propel to reduce the effects of alcohol. Drinking a 1 to 1 ratio of non-alcoholic to alcoholic beverages is a good policy -that's one serving of water for every serving of alcohol.It is preferable to have a greater ratio of non-alcohol to alcohol.
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