Never heard of them, so I had a look at the website.
On the face of it there’s a logic to the idea. Your taste and smell senses are tightly linked – try eating whilst holding your nose – so I’m prepared to believe that drinking tap water with a glorified air freshener under your nose might trick your brain into thinking it’s flavoured.
But… so what? What are her “expectations” exactly? It is absolutely not going to “detox” or provide any of the other pseudoscientific benefits claimed in the product descriptions.
Chuck half a SIS tablet into a regular water bottle, you’ll get water that tastes vaguely of lemon or cola and add valuable electrolytes. Plus you’re not tied into a proprietary pod system costing two or three quid for “up to” 5 litres.