Originally posted by: Descartes
Originally posted by: KarmaPolice
how long does wine last after you open the bottle.
I have opened bottles that last more than a month. I own part of a vineyard out of Oregon and made my own wine for several years (Pinot Gris and Pinot Noir mostly, but do a lot of "country" wines like Blackberry, Blueberry, etc. as well). As part of the process, we blind tested several preservation methods:
1) Nitrogen purging. This purges the headspace of a bottle with nitrogen in order to reduce the interaction of oxygen with the wine.
2) "Vacuum" methods. This is similar in purpose to the nitrogen purpose. All just try to reduce the amount of oxygen that interacts with the wine.
3) Reducing the headspace using creative methods. This includes filling the wine with something to increase the volume (like marbles... seriously) or simply using a smaller bottle.
I don't want to waste time and get into all of the details, but the winner by a large margin was #3. It makes sense, really; you're just trying to reduce the headspace and thus the amount of oxygen available to the wine, so it follows that increasing the volume of the wine or decreasing the volume of the container will accomplish that. Simply pour a fresh bottle into two half bottles and recork. That's it. Serve out of one of the half bottles and you'll be fine for a few days. If you want to have that half bottle last for a while, you could even split it among two quarter bottles, but that's a bit too much work. Refrigeration will do add a few days of life to the half bottle.
I should note that, in my experience, the vacuum methods and nitrogen purging methods do almost nothing whatsoever in terms of preservation. In almost all cases there was a marked difference between the fresh bottle and the preserved bottle.
Here is an easy method for what you describe.
Any clean 2 liter or plastic bottle. Pour the wine in and squeeze the bottle until the wine is at the top and add the cap. No air in the bottle.