Duck soup isn't something you get, it's something you make. http://www.wuzzles.com/ferrets/docum...isducksoup.htm
That's all i could find on it right now, I'm in a hurry but just maybe search this forum and you might find some recipes. Lax is a laxative that ferrets should have weekly so they don't get hairballs or blockages because surgery for blockages is very expensive.