Opened another bottle? No worries, you can keep it.
Use a special stopper designed for sparkling wines. Then place the bottle in a cool spot. If you want to keep the champagne for longer than a few days, you can use the Coravin system for champagne.
Whether you store the bottle upright or on its side doesn’t affect the wine’s quality.
With these simple tips, you’ll get the most out of every bottle of champagne, even if you don’t finish it in one sitting.