Beer is mostly water and its quality matters but moreso for mash beers.
Yeast makes flavours that are effected by minerals in the water.
I use a bucket filter for making the water cleaner. Especially chlorine is a bad bad thing to find in the water. Terrible terrible thing.
For making a bucket filter you will need a cheap plastic bucket, one Britta filter cartridge (the round type that goes in the jugs) and a hole saw. Cut a hole in the bottom of the bucket and insert the filter cartridge. Now rest the bucket inside the neck of your fermenter and add the water to the bucket. The clean water will flow into your beer and stop the yeast from having chlorine for binding onto phenols -> producing chlorophenols, which taste like bandaids isn't it.
It is looking like this:
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A wise man showed me this way, isn't it.