Great recycling idea. Turn empty soda & water bottles into a self-watering vertical garden. I’ve gotta try this! It is also being promoted as a means of helping those in 3rd world dry climates to grow food. I love it. You will also.

See the youtube video at http://youtu.be/-uDbjZ9roEQ

See also “Combating Malnutrition in the Drylands”