I recently came across the http://www.earthbox.com/ while looking for design for pots for my terrace garden. This design it appears saves water and ensures there are no trays with stagnant water etc.
They dont sell this product in India and have no distributors.
I came across some projects here in Bangalore
http://www.globalgiving.org/projects/vegetable-gardens-and-internet-for-indian-youth/updates/
But was hoping that there was a local solution that I can buy/use. Any inputs would be much appreciated.