Noah's Sparkling Spring Water Berry Pomegranate

Dear The FDA,
Can we get a little stricter on ingredient lists? I mean what constitutes natural flavoring? I could soak muddy rocks in a vat of water, would that fall under the category of natural flavoring? Take this can of Noah's for instance. It's a nice little drink. It's obviously flavored soda water, but the ingredients only like carbonated water and natural flavoring. Since the can also states that it contains 0% juice, I want to know what it is that I'm drinking that is creating that berry pomegranate flavor. I like the flavor, a lot actually. This reminds me a lot of the Dry Sodas. I hate seltzer water, but I really enjoy those, and I enjoy this a good deal as well. The Dry bottles list what is flavoring them though. This is just natural flavoring. Does that mean that they just soaked fruit in the carbonated water and then strained them out? How about a little guidance here? I like this drink it's lightly flavored sparkling water that makes you feel like an adult, even though it looks like it's marketed towards kids. If you could get kids hooked on this stuff instead of regular soda, the world would be a better place. I'm just the curious sort. Also, what is this that I've been hearing that if a drink has less than 4 calories, companies can now claim them to be zero calories? FDA, you either need to go back to school for some basic arithmetic, or stop being such a liar.
Sincerely,
The Thirsty Dudes