Water costs less than a half cent per gallon. Water could double, triple or quadruple in price and still be 'affordable' for the poor to drink. It certainly would not cause them to drink bottled water, which is like 10,000x more expensive- But, Shorter showers and no more watered lawns? Absolutely. But if all it takes to survive for a family of four to have clean drinking water is 5 cents, i think you might be claiming it impacts the poor a little bit too far.