Slow day at work, and Schutzie is bored, so some thoughts on water carriers;
First, this isn't rocket science. A water jug has to be tough, seal tight, and fit nicely into the odd corner of the raft. It should be made of (non cancer causing) plastic.
The good old stand by Gerry can, available for less than $20 just about anywhere served me well in commercial use. On this item Schutzie takes the "if it ain't broke don't fiddle with it" approach.
We also took advantage of the Gott freeze bottles that screwed into the cooler lid; each one held about a quart of liquid. On one Grand Canyon trip we calculated that we had 6 gallons of water in those freeze bottles, and the only thing better than cracking one of them when the temp was over 100 was the free beers a Western Guide handed to me after we'd been out for 2 days.
It would take more than a lot of ways to tie a water jug down, and the ability to sit on the thing, for me to justify $85 or even $55. That is, unless it comes filled with one's favorite beverage.
Just something to think about ..........