Over the years I got out of all carbonated drinks and excessive coffee by phasing in homebrewed black, green and herbal teas. I feel a lot healthier and my previously chronic heartburn and gastritis magically went away.
Now I just start the day with a mug of loose leaf tea and keep re-steeping it as the day goes on. By the time noon comes around there is little to no caffeine left but I still get some tea flavor as well as the hit of hot liquid my body is used to.
When at home I brew gong fu style which keeps more caffeine as I reload the gaiwan or tea pot but that’s just a preference of mine. Highly recommend Chinese/Taiwanese teas, especially Oolong if you’re looking for an alternative to coffee or soda.