I liked this video about recreating coke https://www.youtube.com/watch?v=TDkH3EbWTYc&t=176s

There's a great book about this if you're interested. Half history lesson half recipes. Check out: Fix the Pumps (which the book tells you is old soda fountain slag for check out a woman's breasts)

Disappointed there is no carbon dioxide injection. In the 90s till date in this corner of India, Mr Butler is a compact pure mechanical device which can make nose tickling strong sodas. If I were a soda fan, I would have DIYed and rejected the flat mop water that most commercial sodas have become.