If you have the money to spend (Rs.20,000), you can invest in a Reverse Osmosis water purification system. It will cost you more initially, but it pays for itself in a couple of years. I am using one in my home for the past 3 years, never went back to bottled water. Nestle, Aquafina, Kinley, all of them sell ground water after processing it through reverse osmosis.
The only downside of reverse osmosis is that it will taste bitter at first. Since bottled water is heavy on minerals and has a TDS of 250-300 it tastes different than reverse osmosis water which has a TDS of 10-20 without minerals. But after a few months of using RO water you will get used to the taste and bottled water will taste bitter to you 
Best thing is you don't need to wait for delivery, or tow heavy bottles. Replacement filters are cheap and only need to be changed once every 6 months or so. The only expensive filter is the RO membrane which costs about Rs. 2,000. But that lasts a very long time. Our RO membrane is more than 3 years old and it is still working fine.