Some food processors use the metal 55 gal. drums for food shipping. They generally use a heavy plastic bag type liner so the product never touches the barrel itself. My family uses them to pack IQF strawberries for rail car shipments, Spice makers use them as well. They are essentially a clean metal barrel w/ no contaminants what so ever.
Hope this helps & good luck!
Traditional Santa Maria Pit
Mini, Small, Medium & Large BGE
Weber 22" OTS & 26" OTG & 18"WSM & WGA
Each wearing custom handles from Marty Leach