What is one method to help keep a wine fresh after opening?

Using vacuum systems that remove air is an effective method for keeping a wine fresh after it has been opened. When a bottle of wine is opened, it is exposed to oxygen, which can lead to oxidation and spoilage over time. Vacuum systems work by creating a vacuum seal inside the bottle, significantly reducing the amount of air present. This helps to slow down the oxidation process and maintain the wine’s flavors and aromas for a longer period after opening.

In contrast, adding water to the bottle dilutes the wine, which can negatively affect its taste and quality. Storing the wine in the refrigerator, while it can slow down some chemical reactions, does not address the air exposure issue unless combined with a vacuum or other protective method. Leaving the bottle open ultimately accelerates the oxidation process and will quickly lead to a decline in the wine's quality.