I don't life coffe, and I rarely drink tea, so whenever I went to people's houses for fika, and they didn't have a hot drink I liked, they would start looking through their cabinets to see of they had some "saft" (fruit/berry flavored concentrate that mixes with water). After a few times of this, I started telling them, "It's fine, I actually really like plain water! Can I have water please?" And I was telling the truth!
I also don't like sparkling water, cause it comes across as bitter to me, and I had a really bad experience with it once as a teen while feeling nauseous....😒😅
Flavored sparkling water is okay, I guess.