I talked to wine shop staff, who recommended a vacuum wine stopper, like this one here. I was skeptical. I know that once oxygen gets to the wine, it starts to change the chemistry, and within a day or two, you have skunky wine that tastes suspiciously like vinegar. Ew.
But, I have found that by using the vacuum stopper AND by putting my vacuum stopped wine in the fridge overnight, I can get about a week out of a bottle. Perfect.
I'll be honest - by the end of the week the wine is definitely not as smooth and delicate, as nuanced, as it was when first opened. Also, I would recommend letting red wine come closer to room temp rather than drinking it straight out of the fridge (the optimal temperature for enjoying red wine is around 60 degrees, so you do want it a little cooler than room temp), but still, the last glass of a bottle can still be enjoyable after a few days in the fridge. Really. I swear.
I have noticed that the finer the wine, the better it keeps. The cheap $6-8 bottle doesn't hold up as well on day three as it did on day one. But, I have an easier time pouring half a $6 bottle of wine down the drain than I do a $20-30 bottle.
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