Yosef Karo, Shulchan Aruch — Yoreh Deah 114 Laws of alcohol and other drinks of Gentiles
“ When one buys in a shop; but if he sees the shopkeeper bring it from the barrel, it is permitted, and we are not concerned that perhaps wine was mixed in, because if wine would be mixed inside the barrel, it would ruin the product. ”
Yosef Karo, Shulchan Aruch — Yoreh Deah 114 Laws of alcohol and other drinks of Gentiles
“ And if it is known that a non-Jew will later be in a city where they do not mix wine, even though that other non-Jews are accustomed to do so, this is permitted to buy from them, as long as you don't know for certainty that they have mixed wine in, because we rely on this lenience that perhaps they have not mixed anything in. And so too for anything like this that is forbidden rabbinically. And if it is known with certainty that some non Jews mix wine in, and some do not mix wine in, then we go according to the majority, as it is unusually for a person to deviate from the norm. ”
Yosef Karo, Shulchan Aruch — Yoreh Deah 114 Laws of alcohol and other drinks of Gentiles
“ Pomegranate wine that is purchased for it's healing properties, is permitted to be bought from the merchant, even if it is not from the barrel, even though that it has a superior appearance to that of wine, because since that people are careful about medicine, they will not want to risk their own careers over this. ”
