It’s a powder to which you add water, shake and drink (I have a pre-mixed version below) . It takes a bit of dissolving, I never managed it completely with either bottle which meant getting gritty blocks of powder on my tongue which fizzed away like Space Dust from the tuck shop at school. It tastes quite nice, with an odd kind of retro flavour to it, like Garvies Pineappleade or something.
This makes if different too, and I think a pleasant alternative to the sometimes harsh tasting and aggressively sugary alternatives.
It does have a refreshing kick to it, but to really learn what effects it has on the trail it would take a lot more regular use.
The bottle it comes in is empty apart from the powder, so you have to add water to it from a burn, a tap, or another bottle. I know for trips you could pre-mix it, or decant it into another bottle, but the principle is still wrong, it just seems so wasteful as whatever happens there’s a single-use plastic bottle to deal with. There’s a 20-serving tub available which is much better, but I’d prefer sachets for outdoor use so I can mix it up on the trail when I want it and keep my bottle for plain water most of the time.
The bottle thing just looks like a lifestyle gimmick to me, selling product to folks in offices to fill up at the water cooler.
So, good product, poorly packaged. If you’re getting some, get the tub and mix your own.