Preservatives are an important part of wine making. You shouldn’t worry that adding 'preservatives' to your home-made wine will somehow make it “not home-made”. The thing we most often recommend is sulfites; which naturally occur in small amounts during fermentation. Not only do sulfites keep wine from developing infections like film yeast, mould, and acetobacter (vinegar bacteria), they also keep the wine from oxidizing. Without the use of sulfites you have to be exceedingly careful to keep all of your equipment very sanitary; and your wine will spoil much more quickly, therefore it must be consumed more quickly. Cleaners and sanitizes are not the same as stabilizers.