I guess simply 'milk' I also missed, which is a bit sweet of course but I wasn't intending to lump it in with fruit juices and added-sugar drinks.
I did almost mention jaljeera, but thought that might be a bit niche. It is also often sweetened though. I've never known not-sweet lassi though? Salted lassi is still sweet underneath, like salted caramel, ime. We could count it with the sweet-ish milk drinks, anyway.
Lassi is a traditional drink where I’m from and contains only salt traditionally. Sweetened lassi is a relatively recent restaurant-led innovation. When I was a kid “lassi” meant salted; you had to specify “sweet lassi” for the sweetened version.
To be fair, the concept of iced tea as an objective desire is considered the provenance of blasphemous original sin by a not insignificant percentage of natives where the parent hails from.