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The idea appears to make sense, but actually, the device does not work. A little pump called the “Fizz Keeper” is available in kitchen supply stores to pressurize previously opened soft drink bottles and prevent loss of carbonation. The idea appears to make sense, but actually, the device does not work.
Just so, how do you use a Fizz Keeper?
Keep soft drinks from going flat with the Fizz Keeper. After removing the cap, screw the Pump & Pour on to the bottle. Squeeze the Pump & Pour several times until the plastic bottle becomes firm. (Don't over pump; the Pump & Pour works best under low pressure.)
In this regard, what is the best way to keep the fizz in an opened carbonated soft drink?
It's especially important to keep the bottle tightly sealed while it is out of the refrigerator since the higher temperature makes the gas want to leave the liquid. Pour yourself a glass of refreshing soda, cap the bottle, and put it right back in the refrigerator. Keep it cold… keep the fizz.
Sodas go flat after being opened and even lose a bit of taste. When you pop the top, the pressure inside the can decreases, causing the CO2 to convert to gas and escape in bubbles . Let a can sit long enough before sipping and you will notice not only the lack of bubbly fizz but also the absence of the carbonic flavor.