http://aerofarms.com/why/technology/
This might be a sideline for the "camp-in-a-box": an aeroponic farm. Incidentally, the technology is intended to be modular and can be set up inside a typical ISO shipping container.
The advertised yield is 30 lb per square foot per year. If this is correct, each 20 foot container could yield 20 X 8 X 8 x 30 = 38 400 lb per year (about 17.4 tons). Therefore, it might be enough to feed 10 people for a year.