![Sick :sick:](./images/smilies/icon_sick.gif)
First off how important is the quality of water to use in the brewing step? I'm sure for best results you should always use the "best quality water" but we'll cover that later. During the brewing process the yeast need to be happy. Is there going to be a difference in filtered city water, distilled water, well water, and genuine mountain spring water <- not bottled! or even glacier melt water? So long as they have the micronutrients they need and they got their sugar how much of difference in choices of water will it make during the brew? I've heard the Scottish Highlands have some of the world's best water for brewing. I assume because it is untainted by human nasties/pollution/chemicals/etc. Wouldn't any mountain water yield the same effect?
Secondly, what kind of water should be used when tempering the high proof distillate? Say for the example of making vodka and we want it flavorless. I know that as American's we think vodka should be a flavorless spirit but other parts of the world would disagree. Let's say, though, that we want a flavorless spirit. "Good quality" mountain mineral water tastes amazing by itself but my experience is that it imparts different flavors into the spirit after the brewing process. When cutting the alcohol would it be best to use as pure water as possible if one is trying to avoid imparting any additional flavors at this point?
Lastly, what is this "good quality water" we speak of? As previously mentioned we will never use city water, so does that make everything else "good quality?" Is distilled water a good source to use or just acceptable because we know it's clean? I've been experimenting with Nanopure™ water that is ultra filtered and has a higher purity than glass distilled or RO (reverse osmosis) water. I don't have a verdict yet but while I have access to it I'd like to try it out - for tempering that is. It's too costly to use in the brew... or would it be worth it?