Last time I tried this...it was alot easier to just buy the concentrate from Cube-Cola rather than trying to source all of the essential oils separately and shear them together.

https://cube-cola.org/

I think you'd end up paying less, too. I paid about 20 bucks for the concentrate bottle plus shipping, made 1.75L of it, thought it was fine but couldn't quite replace Coke in my diet, and didn't buy again. Had I done it all from scratch, I'm pretty sure I would've paid more and had a bunch of essential oil bottles leftover, going to waste.