If by pints you mean 16oz bottles,then one drop should do it. As I understand from cooper's,one drop for 12-16oz,2 drops for the cooper's 25.16oz PET bottles.
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Everything works if ya let it-Roady(meatloaf)
Bag sizes have US / OZ sizes, UK have different measurements, bag didn't help to much. Being very indecisive I added one and a half per pint bottle. They actually split really easy. I quite like a fuzzy pint, so hope I haven't buggered it.
Thanks for the advice and will let you k ow how it goes ( even if it means you can say I told you so)