Champagne forms bubbles that enhance the enjoyment of drinking it. Once you open a bottle of Champagne, the carbon dioxide releases. The bubbles eventually stop forming and the beverage loses its fizz. While you can preserve the bubbles in the short-term, you can't salvage them completely. Champagne remains fresh and safe to consume only as long as you store it properly after opening it.
Place a hermetic stopper cork onto the Champagne bottle immediately after you open it. "Hermetic" simply means an airtight cork. You can purchase these corks at most wine or party stores.
Insert the long handle of a spoon into the top of the champagne bottle if you do not have a stopper cork. The long handle of the spoon helps to keep the Champagne bubbly after you open it.
Cover the top of the champagne bottle with plastic wrap instead of using a stopper or spoon. Secure the plastic wrap in place with a rubber band. This helps to keep debris out of the bottle. Store the Champagne bottle into the refrigerator after you cover the opening until you are ready to consume it.