What is the simplest way to extend the life of wine?

The simplest way to extend the life of wine is by replacing the closure and refrigerating it. When a bottle of wine is opened, it begins to oxidize, which can lead to undesirable flavors and aromas over time. By replacing the original closure—typically a cork or cap—with a proper seal, you minimize exposure to air, thereby slowing down the oxidation process. Refrigeration also plays a crucial role as cooler temperatures can further inhibit spoilage and help preserve the wine's freshness for a longer period.

Other methods listed might provide some benefits but are typically less straightforward or effective for the average consumer. For example, transferring the wine to a larger bottle would increase the air-to-wine ratio, potentially accelerating oxidation rather than slowing it. Storing wine at room temperature could expose it to conditions that encourage spoilage, while adding a preserving gas can be more technical and may not be easily accessible or practical for everyone.