beers are brewed around the world using local water
some of the signature taste of certain beers is the water they use
Such as Coors having mountain fresh water that has little in it
And remember, most beers got famous using what ever water came from the stream or well at their site
and it is all different
If you want to emulate a beer you need water that is like theirs
SO, Yes water is important. to different beers
to your home brewery, water is important if you want to create certain styles
AND, if your water taste good coming out of your tap, and is not so way out of balance it hurts (which would have an off flavor)
then
NO, your water does not mater
I brew with well water, sort of hard, but I do no fret a lot. My beers are good so why worry
Relax, don't worry and have a home brew