I live in the US, and can only seem to find a variety of soda syrups that ship to Canada here.
https://www.sodacentre.com/collections/syrup
This was my best lead but am looking for sometime similar.
You could likely make a “simple syrup”, keep in fridge and add things like pureed lime and such.
(it actually never occurred to me that you could buy syrups - but I suppose that makes sense!)
Ah I got a soda stream specifically so I could make soda at home for cheaper. My wife has a terrible addition to Dr. Pepper and I’m hoping to find a cheaper alternative.
But making simple syrup is something we do for Amaretto Sours already, and I’m sure could make a decent seltzer have some better taste.
Let us know how it goes! I actually don’t have a soda stream, but my folks do, and this is something I’d like to try. If you don’t waste ingredients, it’ll be way cheaper than Dr. Pepper. I admit I prefer his cousin, who happens to be a Sgt. (with a somewhat lonely heart…)