This type of question can be answered in various styles. What I did this year was that I attempted this question as my 1st question and drew a World Map "Neat and Clean" on the very 1st page of copy; stated 15 various disputes on water across the world.

Described water resources, water types, water usage, causes of it's scarcity and shortage. In the 2nd portion I kept it limited to Pakistan only. Described Water Crisis in Pakistan with India from the day of Partition, Indus Treaty, IRSA, World Bank Report for water shortage in Pakistan, it remedies and etc etc.

This is knowledge based question, so the more you know, the better would be the answer.

You can also visit the link
http://www.pakissan.com/english/wate...remedies.shtml

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True knowledge exists in knowing that you know nothing. "Socrates"