if you freeze the purees and seal them right they last quite a long time. i provide peppers and purees for a local pizza place down here for the danger wings he makes. this has gone on for years and there has never been a freshness issue. freezing the whole peppers last a long time as well but if you want to keep them whole they will be soft upon thawing. this would make bighting with food kind of unpleasant. no vinegar is needed for the purees though. flavour loss could be an issue but the heat will still be there.