There are thousands of similar testimonials by people using Colloidal Silver . And so nothing new here I'm afraid.
Silver kills numerous pathogens and/or conditions which would include, though not limited to, the gut. And so no smoking gun with that.
As for Joe Silver water, no one can say beyond that of the isolated claims that it somehow differs. Though again, I'm confident that you'd be more than willing to send some out for analysis against those(so called) primitive solutions right?