Re: Transporting water?
I struggle to believe you're really that stupid not to see that this has uses. Clearly you've never seen ready-to-drink milkshakes on sale, only the kind you mix your own milk with powder. Or pre-made sandwiches, only shops selling bread and ham separately.
If you want lunch at work or while travelling, faffing about mixing things together IS clearly a faff and if the point of this product is convenience, then more convenience is clearly better.