I’ve never seen any soft drinks on the market or online that have this kind of “instant fizz”
Emergen-c, and alka-seltzer, both create a fizzy drink, but note that neither is a “soft drink” per se, they’re both medical products (altohugh emergen-c’s medical claims of the benefits of macrodoses of vitamin C are dubious at best)
notably mixing a base like sodium bicarbonate and an acid like citric acid produces a lot of SALT, in this case sodium citrate, which is quite salty tasting and the recipe for most soft drinks do not include high amounts of salty flavours like sodium citrate
If you want to have fun carbonating at home, I would suggest in investing in a Soda Stream or similar device, which lets you carbonate anything you want with compressed CO2 which will taste better than a spoonful of sodium citrate. a soda stream won’t fit in your pocket though
I have a bottle of home made carbonated hibiscus herbal tea soda in my fridge
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