Mexico City is just the beginning. Here are 11 other cities at risk of running out of water.

• Mexico City may run out of drinking water by the end of this month.
• Water scarcity is a worldwide problem that many other countries are already facing.
• Often, the problem lies in how the water is managed rather than how much is available.

Mexico City is on the brink of a water catastrophe. Experts predict that the city of 8.8 million people could run out of drinking water this month.