Beer is 95% water.
Of course it is. That why beer is a good hydrator. Water is toxic when contaminated as most in the wild is. Whereas you don’t get disease from beer. The alcohol kills the germs.
The brits drink a cup or two of tea during the day and then go to the pub for a hydrating pint or two in the evening.
Beer provides the daily need for water without the high probability of an infectious disease or diaharea