When Ramadan is during the summer, observant Muslims in hot Middle Eastern countries still have to work, oftentimes in the heat, and fasting includes no water either. Maybe it's because they're used to it, but the point is, 140 degrees is certainly doable with water, even if it's not a lot of fun.
One of the strongest principles of Islamic law is that necessity overrides prohibition. If you're working outside in severe heat and becoming dehydrated, you're allowed to -- and arguably required to -- drink water, Ramadan or no Ramadan.
