Do I have to finish the bottle when I open a bottle of wine? Just becouse of this, I usually feel reluctant to open bottles! If it's possible, how and how long can an open bottle of wine be stored? I have a plastic bottle cap to replace the cork, and it is said to have a vacuum function via a simple pump mechanism, but I'm not sure about whether it works or not. Besides, I do not fully trust myself for wine tasting yet...Any help appreciated...