You can’t put the cork back in like you did before you opened the bottle. You just need to try to keep the air tight.
But this is not a very good way to preserve wine that has been opened but not drunk: 1. Reseal the bottle with a new cork and put it in the refrigerator.
Make sure the stopper you choose is strong enough to minimize air entry into the bottle.
2. Pour the rest into a smaller bottle, then re-cork and store in the fridge.
It’s a little more complicated, but it works better.
3. Finish drinking the wine as soon as possible.
Because from the moment a wine is opened, the air starts to react with the wine.
After opening a bottle of wine, it usually takes about 3 days to completely spoil (white wine takes about 2 days).
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