Buying plastic drums (AKA: Blue Oak) 

I have wasted an incredible amount of time, money, and cider using blue plastic drums/barres that previously held flavour/juice concentrates. I just found a source of drums that are ready for my 2024 harvest. They previously held 20% hydrogen peroxide solution that was used for cleaning lines in a dairy. No odor, no flavour, no residue.
I strongly recommend that you search them out and just stay away from anything that has even a hint of odour.