I would just use rain water in a rain barrel, hook it to a hose and use it to water outdoor vegtables. Also if you use a rain barrel you can put fish inside of it to create a natural algae eater so bugs arent attracted to it. (goldfish should work fine)

Use rain water & heat it will Solar Thermal technology for Steam Generation.

sainipankaj13@gmail.com

Rainwater barrel collector:

http://www.amazon.com/Open-Head-Plastic-...

that then fills a tea kettle:

http://www.amazon.com/Pedrini-Tea-Kettle...

that is heated by a 25" Parabolic Mirror that reflects sunlight into a focal point under the tea kettle to heat the water and generate steam:

http://www.greenpowerscience.com/PARABOL...

that uses metal tubing that is directed into a steam engine:

http://www.mikebrownsolutions.com/mbstea...

that uses a belt attached to an electric generator:

http://www.amazon.com/Bicycle-Generator-...

and gives you energy.

I already did. I built a hydroelectric dam.

You're not going to do it any other way, sorry.