Keeping Carbonated Drinks Fizzy When Opened

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I once won a competition to keep Coke fresh when opened, as the plastic bottle was drunk the CO2 would come out of the drink by Brownian Motion into the air in the bottle, and thus the drink would go more and more flat as the volume of air increased. My solution was simple, just squeeze all the air out of the plastic bottle and the CO2 cannot escape from the drink by Brownian Motion. For a while my solution was printed on the bottles, and I think that it was taken off for economic reasons by Coke. This solution will work for all gassy drinks. And of course, water is more healthy, the UK used to give health warnings in hot weather because soft drinks with sugar are a diuretic.