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I got it From Nature With Love.  No you do not have to use if you use food products.  For thick foods like pumpkin, carrot, banana, I use 1 oz ppo.  For stuff that is mainly water, like cucmbers, I just make sure that there are no chunks and use it as my water.  I do all cucumbers as my water for my cucumber mint.
I got the black oxide from Brambleberry and the charcoal at first from the heath food store(in the capsuls) but then I switch to New Directions.