The invention relates to bioengineering and the foods industry and relates to consortia of microorganisms and strains of bacteria and yeasts, and is directed to methods for producing a fermented base in the form of a semifinished product of bread kvass, fermentation kvass and alcohol-free kvass in a single process cycle with the aid of consortia and strains of bacteria and yeasts as well as to methods for producing a liquid kombucha culture, kombucha concentrates and kombucha drinks and vegetable extracts in a single process cycle.