This is not difficult to find at all in the US. I have tried several sparking waters that use actual ingredients - I don't recall all of them, but Spindrift is

This is not difficult to find at all in the US. I have tried several sparking waters that use actual ingredients - I don't recall all of them, but Spindrift is definitely one: https://drinkspindrift.com/pages/whats-inside https://drinkspindrift.com/pages/whats-inside. Have you Googled at all to try and find one of these brands? There are no regulations necessary for this - thanks to capitalism, if people want real flavoring in their sparkling water, companies will make it. Regulation is about preventing companies from doing bad things, not about getting them to make good products.