Jeesh.
Only in British Columbia's southern parts could one get bottled water. Our tap water is fine, and if you don't trust your tanks, empty them and clean them (see Peggy's post).
We use a "Rainfresh" (Canadian company) carbon and ceramic filter (under galley sink) when we are concerned. (FYI: Brita and PUR tap filters remove some chemicals and taste but NOT biological issues, such as giardia. Carbon/ceramic filters such as Rainfresh gets rid of taste, chemicals, protozoa such as giardia and some bacteria. But chemical such as chlorine - - or UV or boiling -- required to get rid of all bacteria and virusus. Chlorine not very effective for protozoa. Chlorine and good filter - - not Brita - - a good combination. )
But we NEVER use bottled water in BC, at home or on our boat. (We see a few buying it and wonder why.)