At this point, we are going to have to bitterly disappoint everyone who, until now, thought that the “spoon in the bottle neck” method works when it comes to keeping the carbonic acid in the bottle for longer. In this case, it’s only a myth. An opened bottle of sparkling wine is ideally preserved using a sparkling wine stopper that tightly seals the bottle. As a result, an at least half-full bottle of sparkling wine can retain its carbonic acid in the fridge for a good day or so. But, as if we didn’t know already: it is generally recommended to drink sparkling wine as soon as the bottle has been opened, as this is when it has its full flavour and the highest level of carbonic acid. So, ideally: empty the bottle!