- How long does seltzer last once opened? The precise answer depends to a large extent on storage conditions — keep opened seltzer refrigerated and tightly closed.
How long does seltzer last in the refrigerator once opened? Seltzer that has been continuously refrigerated will keep at best quality for about 2 to 4 days after opening.
Is opened seltzer safe to drink after the "expiration" date on the bottle? Yes, provided it is properly stored and the bottle is undamaged - commercially packaged seltzer will typically carry a " Best By," "Best if Used By," "Best Before", or "Best When Used By" date but this is not a safety date, it is the manufacturer's estimate of how long the seltzer will remain at peak quality.
How can you tell if opened seltzer is bad or spoiled? After opening, commercially manufactured seltzer will start to become flat and lose flavor; if the seltzer develops an off odor, flavor or appearance it should be discarded.
Discard all seltzer from cans or bottles that are leaking, rusting, bulging or severely dented.
Sources: For details about data sources used for food storage information, please click here