Drinks of the Immortals
Before nectar was the drink of bees it was the drink of the gods. Nectar is the Latinized version of the Greek νέκταρ which breaks down into nek (death) and tar (overcoming).
Ambrosial now refers to something that is extremely pleasing to the senses, especially taste. At further examination you can see its parts a- (not) + mbrotos (mortal). In Greek mythology the gods were often drinking or eating something called ambrosia, literally meaning immortal, which imbued them with youth.
Uisce beatha is Gaelic phrase from which we take our word whiskey (a mispronunciation of the first word uisce). Uisce beatha literally means water of life.