> the note would continue with a warning instructing you not to leave that jug in the cool cupboard for 21 days, or it would turn into wine I read (cannot find

> the note would continue with a warning instructing you not to leave that jug in the cool cupboard for 21 days, or it would turn into wine I read (cannot find the source now though) that's similar to today's homemade alcohol/beer in Japan, where there's a limit of what % of alcohol you can make at home. So all the official instructions include a last step: "mix in water until the alcohol percentage is below the legal limit". Of course people just ignore this to have stronger alcohol.