(Edit: After writing, posting and reading this, it's a bit of a ramble. Some things aren't just said in two sentences...for me anyway.)
Hummm. I had no clue about this. I was told to use strictly distilled because it didnt have the added stuff. I will keep this in mind. Thanks.
Don't get to freaked out by water, especially if you are using Dry or Liquid Malt Extract (DME/LME)
If you are using all grain, yes those minerals that are not found in distilled water could be a major loss in your beer's flavor if you are mashing grains. In this case a water's chemistry has much to do with how well an all grain mash will achieve the right pH balance along with other factors that make a "wort" highly fermentable and tasty.
Extracts are based on a grain, or grains that have had the fermentables mashed out for you. If they are from a reputable house most of the grains potential will be brought out through the correct use of water, grain crush, temperature and so on during their mash stage. What they will deliver you is a form of grain extract and this powder or syrup is gold.
There is a small price to pay. (Well actually there is a bigger price $$ to pay for the extract than for grain.) LME or DME will give you the flavor of whatever the malt brewer (if that is a job title) produces and passes on to the homebrewer. You can certainly make good beer using extract.
All grain just leaves it a little more in your hands to make a beer of your choice. It's not a real tough thing to do. Just takes some practice and knowledge. The latter can be found here on HBT.
It's a lot of fun making beer. Some people will tell you that you have to go all grain to make good beer. I say phooey on that. You will make good beer either way.
I'm sorry this post is to long and I"m straying off the main topic.. It happens
To anybody who reads this.. dont let water bring you to a confused point, especially when you first start out. Much more critical things to understand (and not hard to control) as a new homebrewer such as proper yeast count, fermentation temp and sanitation.
This is of course my own humble opinion. If I'm wrong. For the sake of beer red pen me!