"I do know that NOT drinking Aqualiv Water continues the dehydration of the brain, leading to all kinds of disorders."
You know nothing of the sort.
I've rarely heard such a ridiculous assertion (except that AquaLiv water can cure cancer and treat HIV/AIDS, but those were simply lies told for commercial gain by AQLV's CEO, Craig Hoffman).
Any water-based fluid taken in reasonable quantities will prevent dehydration of the brain.
Of course, by the same token, any water-based fluid taken in excessive quantities will cause hyponatremia and cerebral edema, both of which can be fatal. The would be equally true of AquaLiv's magic water as any other sort of water.