How can wine be preserved without added sulphites?

Through the fermentation process itself. Just like other foods such as fermented vegetables, kombucha, etc. Fermentation is a natural phenomenon and has always been a genuine method of food preservation used by mankind. This natural biochemical process creates a new food with new physical and chemical properties, particularly in terms of shelf life. All of the following factors play a role in a kind of balancing act: Naturally occurring sulphites (produced by the plant itself), the acids and acidity spectrum, alcohol and minerality.