How to Be a Water Superpower

 What the successful do :

1. Pumps and purifies from rivers, aquifers and the See of Galilee

2. Desalinates

3. Drills deep wells for brackish water

4. Develops seeds that thrive on salty water

5. Treats sewage and reuses on crops

6. Harvests rainwater

7. Discourages water intensive landscaping

8. Seeds clouds

9. Demands efficient toilets

10. Fixes leaks proactively and promptly repairs

11. Teaches schoolkids about value of water

12. Prices water realistically for efficiency

13. Incentivizes water efficiency

14. Reduces evaporation

15. Transformed agriculture to use water efficient crops

16. Drip irrigation.

"There is no single answer" "All of the above". From Seth Siegel's must-read "Let There be Water"