I seem to live right on the edge of dehydration at all times, anyway. If there is the slightest extra loss of moisture (EXCESSIVE sweating -- hot flashes here -- crying -- menopause here

), I get the most excruciating leg cramps in the night. So, a) the 64oz of water per day, not a myth at all; in fact, more is even better -- the body is about, what, 86% water? BUT! you don't have to get it all from plain water -- any non-alcoholic, non-caffeinated beverage counts (even thin soup!); and b) vaping does seem to increase the need for water -- when I first started doing this pretty regular, the leg cramps informed me with a vengeance that I needed to INCREASE my already-prodigious water consumption. And now that I AM doing this pretty regularly, and smoking less and less all the time, I do notice a dry mouth/throat more often. It seems counter-intuitive; stop breathing smoke, start breathing vapor -- seems like you'd need less, doesn't it? But you do in fact need more.
*shrug* The weirdness of life.
Andria