Thousands of us undoubtedly spent this Canada Day weekend playing in or simply lounging by our abundant oceans, lakes and rivers. Water is part of our national identity. Canada contains as much as 20 per cent of the entire world's fresh water supply. It's our birthright and our national treasure. But we might not be as rich as we think. The granddaughter of oceanographer Jacques-Yves Cousteau told us we're headed for a water crisis because we're not taking care of our inheritance.