You have to set up what's called a window farm. A hydroponic contraption that basically force feeds plants water and nutrients.
Everything is done out of plastic bottles from the recycling bin. You also have to get some supplies from the hardware store, and add nutrients and water.
You just need a window with good light, and a little electricity to pump the water.
For more information, go to:
http://www.windowfarms.org/
http://jennaspevack.com/windowfarm/