I love a new (to me) gadget that a neighbor recommended. You can pump
the air out of an opened bottle of wine, producing a vacuum--and the
wine then keeps quite well for a few days (in the fridge). I got mine
at a liquor/wine store. It consists of a white plastic pump, and a
special rubber plug. You pump it up and down, and as it becomes
increasingly hard to pump, you know there is some degree of a vacuum,
then you store in the fridge. It really works well. Ask about it at
your wine shop.
I recommend it.
Cheers, Nancree