Copper pots and acidic foods will not harm you. Applebutter is made in untinned copper, and so is beer.
The problem is if you don't keep the copper cleana and shinny, or you let the acidic foods sit, verdigris forms, [green tarnish] and that's what makes you sick. Because folks don't remember this, or because folks used to keep foods simmering over several days, eat some, add some fresh ingredients and simmer, eat some more the next day, add more ingredients, simmer, and repeat day after day, but don't clean and shine the interior of the copper pot..., tinning of copper began.
Peas porridge hot, peas porridge cold, peas porridge in the pot, nine days old... :shock:
LD