What about switching to seltzer you can mix with caffeine powder? If you look you should be able to find a “cola” flavored one which while not the same should at least be an approximation. From some quick googling it appears seltzer still has carbonic acid which ain’t great for your teeth but it’s not as bad as regular soda’s acid-combo [1].
Thanks. I googled for cola-flavored caffeine powder, but couldn't find anything. Do you have an example?
The caffeine content of Coke is relatively low (only about a third or fourth of coffee, and lower than other cola products), which makes it practical for me to sip it all day. I guess I'm as much addicted to the taste as to the caffeine.
[1] https://espiredental.com/is-seltzer-really-bad-for-your-teet...