My overly religious cousin turned hundreds of kilograms of apples into opalescent juice. He stored the juice in cleaned used 4 liter milk containers which he kept in a chest freezer. After several years of storage with the juice being frozen, he offered it to me and I gladly accepted. I do not understand what happened, but that apple juice had some real "KICK". There must be some sort of slow fermenting going on.
I did not have to be told twice to , "Drink your juice, Dear." Two glasses and I was done.