[NatW]

>with respect to the drinking of water, that's unlikely...

With my reading, taking water - in gulps to wash down the pill - at particular times/regularity could be a/the significant factor getting measured in this study. Perhaps there is a threshold effect in taking the water (e.g: it helps people on the threshold of dehydration), or perhaps it's the time of day taken. I may be wrong, but I don't think it should just be summarily dismissed yet.