There are certainly enough strange things over here to do a drink version, but taking into account the shipping cost if it was twice-monthly just like Candy Japan (2 cans every two weeks) then the subscription cost would need to be ~$38 to cover the extra shipping cost.

First time I went to Japan was just when 9/11 happened (watched it from the traditional guest house common area TV). So liquid limits had not yet been invented at this point. Before heading home I filled my backpack with a bunch of different drinks from the vending machines and then had a fun time trying each with friends and giving them ratings.

I think there would be even more different tastes with drinks. With candy as long as it's sweet 99% of people can enjoy at least a bit. But even in our small friends trial there were people who could not stand anything coffee based. Green tea based drinks are also a bit of an acquired taste and seem to be disliked by many (our tea-related candy that included some green tea bags got relatively low feedback).

Maybe it would have to be mostly sugary drinks. Or there would need to be a way to indicate which types of drinks you can tolerate, in which case things would get a bit more complicated.