I have used the gray rubbermaid cans that are stamped NSF #2 safe for food contact. I have also seen white ones around too, also stamped NSF #2.

I have yet to have any of these "barrel guys" or "tote guys" tell me EXACTLY what was previously stored in them. They all say it's food grade, or had flavoring agents, or had a "non-toxic" substance, but they never tell me the exact contents. And, for me, non-toxic is NOT the same as food-safe.

If the shipping/freight is not too much, I'll be ordering brand new barrels from U.S. Plastic Corp.