Oronamium C.
It's an energy drink that's incredibly tame in it's ingredients compared to energy drinks across the globe and drinking it once a day would make me feel very energized without feeling jittery or nervous.
Besides that, this one vending machine in Osaka had this delicious dessert cake drink that was so good but I never saw that drink anywhere again.
Also this same vending machine gave me a coffee along with my drink, so getting lucky with double pulls from machines is definitely a thing!