One of the commenters to the Telegraph article recommended a scientific test: Take the 21 scientists to the middle of the Sahara Desert and give 10 of them water and the other 11 nothing and leave them there for 30 days. Then checki which group was dehydrated.
Actually if they had no food both groups would be dehydrated.
The ones with no water would die within three days or so. The ones who had water would live longer but without food they also would become dehydrated.