To keep your wine fresh you can always put the cork back on, but that lacks style and it never fits on correctly after it first comes off. You need something to make sure it’s airtight. Something amusing like these Splash Bottle Stoppers.
They make a great gift for any occasion and are dishwasher safe. And yes, they fit most wine bottles. The size is 3/4″ diameter x 2-1/2″. Let these two dive right into your bottle and make a splash.
They make great conversation pieces and are just $6.47 from Amazon.