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Must ensure that the bottle's seal is intact and the cap secured.
The bottle should be firm and the plastic should have turned yellowish or dull.
Don't fall prey to same sounding fake names. The label should be properly printed with no errors in fonts or spelling. Check for brand logos among other things. Also, always check the ISI Mark on the packed bottle.
Good quality drinking water should be clear and transparent.
It should not have any odor or taste.
If you have one, Total Dissolved Solids) meter can be used to check the water's purity.
Always check the expiry date before purchasing any new packaged bottle.