Yes, you too can be a moisture farmer just like in Star Wars! You just need some moisture vaporators, ie devices that take moisture out of the air. I was curious and found these devices actually exist. Ones like this :

Here are some links to companies that make these :

http://www.air2water.net/residential_products_countertop.html

http://www.superiorwater.com.au/

http://www.airwatercorp.com/

http://www.globalrainbox.com/

Now you can start growing your empire. Just be sure to keep a look out for a couple of droids.