Actually it is true that beer fights dehydration faster than water, because particle density in beer is "isotonic", and isotonic liquids can be assimiliated faster by the organism, than normal water. However, the effect is the greatest with what in German is called "Weißbier" and "Weizenbier".
For after sports, or long long bike-tours, I use a mix of beer and lemonade, 50-50. In German, it is a long-known drink, most popular in Southern Germany and Bavaria, where it is called "Radler". And there you already have it in the name: Radler translates (in a linear fashion) into "biker" (=> bicycle-rider).
An also isotonic alternative is alcohol-free beer, I have read just days ago. But not all taste acceptable.
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