There has been some bad press about the quality of drinking water in France recently – my experience is that the water from the tap has been clear, cool and clean – but don’t just take my word for it – you can see the latest regulatory test results online at…
http://www.sante-sports.gouv.fr/dossiers/sante/eau/eau-potable/eau-potable.html
Bottled water is good, but not tested as frequently as tap water and it costs about 1,000 times more.
If in doubt, drink wine – if you are not sure about the quality call round to my place and I will test the wine for you with great pleasure