Soda is gross once you give it up for a long time too! People can start with seltzer if they still need the carbonation. They can’t expect soda replacement from it but after a while it’s what you’ll prefer anyway.
I gave up soda a long time ago, and the other week I got a Code Red 20oz out of the blue because it seemed like a good treat. It tasted like pure syrup and I swear I was sweating and my heart was fluttering. So unpleasant and unnecessary.