Mountain Dew is a nice drink, full of caffeine, however nowhere near as nice as Schweppes SparklingDuet, which can safely be consumed without the fear of not being able to get to sleep.

Orange and lemon flavour.

Mountain Dew sold in Australia is caffeine-free, I believe Diet-Caffeine free Mountain Dew is available in NewZealand.

Alternatively, drink a 1.5lt bottle of it to get your caffeine fix when you need to finish off that long COMP420 report.