Lately I've been thinking about making a UDS, specifically for larger cooks and also to give me something to do this winter. Of course, Big Poppas makes this easy but i still have to come up with the barrel. I found these on CL. Since they had fruit juice in them previously, are they considered the "food grade" that Big Poppas recommends? Besides being unlined is there anything else I should look for in a drum?