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Once you open a bottle of red wine and reseal it, do you have to refrigerate it or will it keep for a while?

I drank one third of the bottle at room temp yesterday and used a rubber stopper and mini-vacuum pump to seal it. I left it out over night.

The issue with wine going bad is due to oxidation of the wine. Oxygen gets in there and reacts with the wine, eventually making it taste sour. However, some wines, especially “young” wines made in the past couple years, actually taste better after they “breathe” for a while. So sometimes a wine will taste better the second day. This is the same reason people decant wines: it introduces oxygen into the wine which can soften the tannins and result in a nicer tasting glass.

However, this doesn’t happen with all wines, and usually by the second day it has passed its peak. Putting it in the fridge will slow down the oxidation rate, but then you end up with a cold glass of red wine, which rarely tastes good. Using the vacuum stopper will help a little to preserve it, but the best way to preserve already-opened wine is to inject inert (non-reactive) gas into the bottle to displace the oxygen. You can get pressurized bottles of inert gas at better wine stores for this purpose.

Or, you do like I do and drink with a friend so that you can finish a bottle within the first or second day.

Kessler Wine Opener