Given the fact that many Europeans drank beer, ale and what have you as a main source of water (the other primary source being food). I'm not surprised if it turns out that it's not too big of a deal. As long as the drinks are as low alcohol content as the ales and beers of the past, then it's all good. Hell even children drank small light beer in the past.

Not saying it isn't poison, just that the body can deal with it in small amounts.