Hello mohannanda123,
Depending upon the source of water (ground water,bore-well water ,river water etc) water is passed through various treatment stages like
chlorination,sand filteration,activated carbon filteration, micron filteration (10 and 5 microns),reverse osmosis for hard water,and final 0.22 micron filtertion
Please refer to scheme of testing and inspection of BSI (Bureau of Indian Standards)
for drinking water quality .The difference between packaged drinking water and water used in beverages is the final step.
water used In packaged drinking water in the final step water is treated with ozone and in beverage quality water this step is omitted.
Please download--
http://bis.org.in/qa...STI_14543_7.pdf
and give your raw water and final treated water to BSI accredited lab for analysis as per IS-14543