The red currant-infused vodka was . . . alright.
It was pretty sour. I first tried it with unsweetened cranberry juice and a splash of lime. That was way too sour.
I then tried it with the juice and cranberry Sprite. That was better, but still too sour.
I then tried it with just cranberry Sprite: 50/50, over ice. That wasn't too sour, but it wasn't particularly good either.
So, I give this infusion experiment a "fail." I still have a few shots left of it. I'll experiment with it some more and see if I can get a better concoction, but I'm not terribly optimistic.
I'll try the black currant-infused vodka later, but I'm guessing that's going to require a lot of sweetening. Black currants are far more sour than their brother reds.