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.

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