Suggestions for how to elevate plain sparkling water?

So I have an aarke device that I absolutely love and it lets me have sparkling water every night with dinner (best purchase of my life I stg). In an attempt to save money & buy less this means I’ve more or less completely stopped buying flavored sparkling water, but sometimes I really really miss having a bit of flavor!!! I’m wondering if anyone has any favorite things they’ll do to elevate or add flavor? My go to has been adding some drops of bitters, or if I have a lemon on hand that will also work, but curious if there are more hacks I hadn’t thought of.