ArticlePerfecting Pyment, Vinifera Vines, and Over-YeastingWritten by Alison Crowe. . . you could also buy some powdered grape tannin, use oak chips, or even use a cup of strong black tea to add some tannin backbone to the wine if it’d be tough for you to obtain grape skins.Already a member? Log InYou'll Also Like Article MEMBERS ONLY Softened Water, High Alcohol Wine, and Tiny Bubbles Water softeners add another wrinkle, namely because they tend to add a lot of sodium. Article MEMBERS ONLY Japanese Beetles, Freezing Grapes, and Adjusting Aged Wine A really innovative and completely natural way to control Japanese beetles is to implement a longer-term biological control program utilizing one of the insect’s natural enemies, the ‘milky spore’ bacteria.