The only thing to put in barrels is dry corn or it cannot come out. The other is for around it. Fermented corn is easy a pkg of yeast or a couple beers, dry koolaide, sugar and corn, add water and 2 weeks later you have the bait. Use a post hole digger, dig a hole where you don't mind it getting larger and bury the sour corn, cover it up...you have to have hogs in the area for any of it to work. I don't use diesel or oil but kreso-dip on my rubbing posts. I also have troughs made from split culvert pipe that I put horse sweet feed in.