Like JMB said, 1 drink in all likelihood will not kill your cut but the better question would be, Is this one drink worth all the extra effort im putting in? I could understand a cheat meal or maybe even a cheat day but i wouldn't eat a piece of cake everyday or a candy bar or even a drink with sugar.
Best bet IMHO is to change that drink to something without sugar.
As far as storing the fat, some are better qualified than me to answer but if your having this drink pwo its probably ok. Otherwise my guess is yes it probably is stored as fat but maybe 3J can chime in.