Based on data from NASA, the World Health Organization and other agencies, the report finds:

• Severe water shortages affecting at least 400 million people today will affect 4 billion people by 2050. Southwestern states such as Arizona will face other severe freshwater shortages by 2025.
• Adequate sanitation facilities are lacking for 2.4 billion people, about 40% of humankind.
• Half of all coastal regions, where 1 billion people live, have degraded through over development or pollution.

So many people have said... my country have lots of water and it is cheap!...really?
DOES YOUR COUNTRY HAVE A WATER CRISIS?
Canada - Australia - USA - United Kingdom - China - Malaysia - Thailand

CANADA - has 20% of the world fresh water but only 0.5% of the world's population (BBC) yet Canada will face water shortage in 15-20 years (CBC).  see below***

Australia
The annual report by the Water Services Association of Australia found that after a decade of punishing drought, authorities in all of Australia's mainland capital cities will need to find new ways to provide water, such as desalination and recycling, in the next five to 10 years. In its report to urban water utilities, the association said water prices will rise steadily in cities to pay for new infrastructure in the driest continent in the world after Antarctica.  New infrastructure could cost up to $25 billion over the next decade and likely would be paid for by higher charges to consumers, said Ross Young, the association's chief executive.  "The 10 years of below average rainfall and drought have been a wake-up call for urban Australia," Young told The Associated Press. "This will send a stronger price signal to consumers about conserving what is a very scarce resource."

The report found that in the fiscal year ending June 2007, rainfall in catchments serving towns and cities fell by as much as 80 percent below average.

Lets go closer to home.

Singapore

`Water is a scarce commodity in Singapore. We have to curb the upward trend in consumption of water, and make its prudent use an ingrained habit. If not, we will be short of water in 15 to 20 years' time. We have to take water conservation measures now to slow  down its increasing demand.'   then Prime Minister Goh Chok Tong

• Boutros Boutros Ghali, PH.D., Former UN Secretary said that the next war will be fought over water.
  (remember Former Egypt's President Sadat's offer of water from the NILE to Israel).
  
• ScienceDaily (Jan. 6, 1999) — A future war over water is a distinct possibility, according to Klaus Toepfer, director-general of the United Nations Environment Programme. Toepfer made his prediction during an interview that appears in the Jan. 1 issue of the scientific journal Environmental Science & Technology. The journal is published by the American Chemical Society, the world's largest scientific society.
  
• More than 50 countries on five continents might soon be caught up in water disputes unless they move quickly to establish agreements on how to share reservoirs, rivers, and underground water acquifers. (GLOBAL POLICY FORUM)

Vietnam by Michael A. Bengwayan. 

Ho Chi Minh City, Vietnam- The ancient Chinese adage of "Do not give a man fish, but  teach him how to fish" is becoming untrue in many parts of the 4,500 km long Mekong river today. That is because there are less fish to catch. In fact, more than 5,000 people marched in Thailand and Laos in 1998 to protest the giant hydroelectric dams which they say are not benefiting them.  But it is not only fish that trouble the waters of the Mekong river today. The waters themselves pose the greatest potential for provoking conflict among China, Laos, Myanmar, Thailand, Cambodia and Vietnam.

http://www.itt.com/waterbook/Vietnam.asp