I thought this would be for people who cannot drink commercially available drinks due to mandated addition of sweeteners.

I stopped consuming these, any that I tried was leaving awful chemical aftertaste that I just cannot get used to.

So instead I was DIY drinks by mixing concentrated fruit juice (with no added sweeteners) with sparkling water.

Also be careful if drink says "natural flavourings" - it's a loophole to add sweetener that is not classified as sweetener, so they don't have to put it on the label, but still tastes awful.