Hey there,
Thanks for posting and sorry for the delay - it was the 4th in the States and we were out celebratin' our freedom

. So let's see what we've got here...
AcademicsAmazing GMAT? Check! Congrats!! Tier II school? Check. Solid GPA. Check. Is that 1st for your graduating class? You're pretty good to go on the academic front it seems.
Professional ExperiencesYou've had a pretty interesting career path to date. It seems you started out the traditional Indian way out of school - took a solid job at a blue chip company. Secure, stable. Then it seems you realized you didn't want to be on the tech side of things and moved to sales? Seems you excelled there too. Then, once again an assumption, you were like, "this isn't what I'm passionate about" and you left to found this water purification company. What I would be interested in learning more about is why water purification? What's next?
InvolvementYou seem to be tying your NGO work with your company and that's great. It seems water is a cause that's close to your heart. However, it seems to be a bit on the new side? A 100 households is a commendable endeavor but it seems like a young one.
GoalsYou have the entrepreneurial experience in your back pocket but what do you really mean entrepreneurship post MBA? Does that mean start your own thing or work for a start up? If it's your own thing, then you have to be careful and research US start up law. If it's work for a start up, you need to do your research too because not everyone can sponsor foreign nationals (nor do they want to, sometimes).
SchoolsIf you're interested in sustainability / renewable resources, there's good news and bad news. The good news is I have a school list for you. The bad news is there aren't too many schools to choose from. So you have Stanford, MIT, Haas, Ross, Duke, and McCombs pretty much. There are others that might have "sustainability" programs but not to that level.
I hope that helps - let me know if you have other questions or if you need me to clarify anything! Happy to help!
Bhavik