We just call it läsk in sweden
Fever tree's stuff is excellent with or without beverage. It's like schweppes but better.
This is a good drink based on yerba mate (which I've never tasted).
I don't really like other soft drinks, but I can do schweppes or any of the following if I'm desperate.
Their cola is pretty good. I would avoid the other ones.
Don't ask why I'm apparently a soft drink nerd. I guess I just like trying new stuff.