Highly recommend a soda stream, or soda stream alternative. My go to is 4 or 5 drops of lime juice in a glass, then the carbonated water. Tastes identical to the canned stuff, but way cheaper (and maybe less preservatives? Idk if the canned water has anything besides fruit juice and water)

I also occasionally like root beer if I’m eating something junky like a pizza slice or burger. I bought a bag in a box of syrup from the small root beer brand I enjoy, and can make my own for a few cents instead of a few bucks per bottle. Plus, I can control the concentration depending on how sweet my sweet tooth is feeling that day