The trick to keeping a beverage cold is in the glassware. You have to invest in a good crystal glassware set. You slightly moisten the glasses, which are of a thick crystal with thick heavy bottom construction in your freezer. The glass will now become the conductor of the chilling for the beverage.
I recommend a good Baccarat Crystal like the one below.
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Baccarat is from the family
Taittinger, a relative of Jean Taittinger produces the glassware and various glass art works. Good quality stuff, a little price-ie but worth the cost and worth handing down to future generations.
It's all in the glassware.
Desmo