Do not use corked wine bottles because elderflower champagne is quite capable of popping out the corks or worse, exploding the bottles. Leave at least an inch of headspace between the surface of the liquid and the rims of the bottles. Secure the tops. Leave at room temperature for a week, burping opening briefly the bottles at least once a day. After the week at room temperature, move them to the refrigerator, but keep burping the bottles occasionally for another week. Sauteed Shrimp Recipe. Elderflower champagne will keep in the refrigerator for several months. The earlier you drink it, the yeastier it will taste. Wait at least 2 weeks from bottling if you want it at its best. The honey version takes slightly longer to ferment out than the sugar version. The final drink should be fizzy and lightly sweet, but not cloyingly so. Note Technically, this fermented elderflower beverage isnt a champagne because it doesnt contain the grape varieties used to make authentic champagne. But its been referred to as elderflower champagne for generations, so that common name is being used here. How To Keep Sparkling Wine Fizzy© 2017