A little help??

Just got my technology project and i am stumped as to what to do for it...
Here's the brief:

''The right to safe and clean drinking water... is a human right that is essential for the full enjoyment of the right to life'' (United Nations,July 2010)
Less than one percent of the world's water is available for human consumption, with the remainder being contained in oceans, glaciers and ice sheets. Population growth, industrial, agricultural and private demands, changes in climate patterns and increasing pollution are some factors that contribute to sincreased pressure on this vital resource.

There are growing concerns around the sustainable, efficient and socially responsible supply, quality monitoring, conservation and use of water.
With a focus on devices and technologies which can help address these concerns, design and name a model which addresses an area of water supply, quality, conservation or use that you have identified.
The model should incorporate electronic and/or mechanical systems and should also be well presented

Note:
The finished artefact need not require the use of water
The maximum dimension of the artefact you present for assessment should not exceed 500 mm



Any ideas? anything will help :)

Thanks