Calpis (pronounced a little like cow-piss) is a soft drink made from milk.
It tastes a little acidic like Yakult and isn’t carbonated. But you can get a soda variety.
The ingredients are water, non-fat dry milk and lactic acid. Mmm.
And it’s been around for almost a hundred years… first marketed in 1919! And the name comes from mashing up ‘Calcium’ with ‘Sarpis’ (the sanscrit word for clarified butter).