I'll be interested to know what you find flappy. I think we're meant to drink it through a straw to save our teeth and aim for as close to plain carbonated water (Perrier water or similar, not water that's made fizzy in some other way) as we can, so it's not full of sugar and sweeteners and things.
As far as I can tell, the thing is to have a bit every day to keep the system in balance rather than gulping down a lot when we are feeling frazzled.
So roughly speaking, the thing is to take time, once a day, to have a quiet sit, with the some carbonated water to drink, and do a bit of quiet reflecting.
This all only applies to people who suffer from chronic hyperventilation, but I gather that a lot of people do a bit, especially if chronically stressed.
Please don't blame me though if it all turns out to be cobblers. I'm not a medic, just an enthusiastic amateur. 