Tree food sources

Need to check if this grows in Karnataka and which part:
http://www.flowersofindia.net/catalog/slides/Tree%20Bean.html

Murungai
http://www.moringafarms.com/growing_it.htm

Coconut

Palmyra Palm, Date Palm

The Mysore Raspberry is an interesting candidate to try and grow.

Barberry fig seeds are a good source of oil. This shrub is a cactus so should grow with very little water.