Sounds like snake oil. Their website says you need to sip water through their straw for 3 seconds two/three times, then repeat those 3 sips up to 2 more times so that puts the effectiveness at somewhere around that of pretty much any other free home remedy. The way those instructions are written seems like it’s meant to intentionally obfuscate that fact too, it’s incredibly unnatural to say “do this thing two to three times, up to three times”.