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Alcohol is a diuretic (it promotes water loss through urine), but not all alcoholic drinks will dehydrate you.
Indeed, according to a review by the British Nutrition Foundation, normal strength beers and lagers actually result in a net gain of around 300ml for every pint (568ml) you drink.
While at the other extreme, concentrated alcoholic drinks that contain little water do dehydrate you, with each single measure of straight spirit (e.g. gin or whisky) resulting in a net loss of 75ml.
However, adding in a mixer, such as tonic water – at least 75ml for a single and 150ml for a double – will balance out this loss.
Wine lies twixt the two with a large glass (250ml) of 13% white wine producing around 350ml of urine, so a net loss of 100ml that you would need to make up with water.
So work on around 300ml (a large glass) of water per bottle and you should be okay.
Although, for the record, I am not suggesting you drink the entire bottle.
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