Inspired by a discussion several years back on this board and the recent discussion about extending open bottle life with gases, I went ahead and purchased a set of six small (5 oz) bottles. I've now finished a few simple experiments with two wines. The results were very encouraging.
All that I did was to immediately poor the opened bottle of wine into the small bottles till they were completely full, then put them into either the fridge, a dark room temperature space, or the freezer. Of course I also enjoyed a glass of the wine right after the opening. The filled volumes should prevent oxygen from getting into the small bottles -- as was pointed out in the previous discussion.
After nearly a week, we did comparison tastings of the wine in the small bottles kept at different temperatures. The fridge and freezer kept wines (both reds) were nearly as good as the original. The room temperature sample was a bit decreased, but not nearly as badly as a wine kept in the bottle for the same length of time.
So, I'll keep exploring this, but wondered if anyone else on this board was also playing with this idea or had other comments.