The first thing to do is buy 2 “food grade” drums. Be careful not to buy drums that were used for toxic materials or trash. You need to burn these barrels for 6 hours minimum to sanitize them. I used all smoke wood when doing this. My neighbor had a ton of apple wood that worked quite well. You will also need to remove all the paint of the drum.
Next, we cut out the door and vents on the bottom. We hinged the door and used electrical box cover with locking washers for the vents.