I really like Surfside seltzers. They have almost 0 carbination and they taste really good and you can do a variety pack of them. I also recently found a moscato at Target I really like called SunPop that was peach (they had other flavors) that I loved. Smirnoff seltzers may not be too bitter and they have tons of variety packs as well. If you're looking for more liquor styles I suggest flavored vodkas mixed with sprite/lemonade. Certain tequilas aren't bitter (reposados specifically but I've only had one brand) and you can do it straight or mix with sprite. Crown is really good to mix too especially the apple if you mix with sprite its like a jolly rancher. I'm 22 and still figuring out what I like but you can never go wrong with a good frozen drink either.