Storing Opened Wines:

So, you have opened your bottle of wine but somehow you did not manage to finish the wine. Do you throw it away? Of course not! Opened wine does not keep long as air comes into contact with the wine and oxidize it. If you corked it back and keep it in the fridge, it may be good for another day. For you want to keep it longer (about 3 to 5 days) you will need those vacuum pump that basically pumps out the air so that the vacuum remains in the wine bottle. A good brand which I use is VacuVin. I found out that you can keep the wine for a week provided that you pump the wine immediately after serving and put it in fridge. Strangely, the wine always taste best on the third or fourth day! If your wine is half finished, one method is to pour the wine into a smaller wine bottle (375ml) and corked it again. That would minimize exposure to air but do try to finish it the next few days.

For Champagne, it is best to finish it when opened. There is a myth about putting a small silver spoon into the opening of the champagne bottle but it has been proven empirically not to work. There are Champagne stoppers available in the market that can keep well for a few hours but I do not recommend it.