There is another alternative that is getting more popular in the US, which are Olipop sodas. They are sweetened with stevia and have only 2-5g of sugar, plus a lot of added fiber.

As someone who very rarely drinks soda of any kind, I find typical Coke or Pepsi products overwhelmingly sweet and feel sick if I actually drink a whole can. I can stomach Olipop though. (No paid endorsement here, I discovered these through my partner. She is a health-obsessed person with a sweet tooth.)