I've read that distilled water is fine for brewing with extract. I've also read that reverse osmosis water is suppose to taste better than distilled water. Does it make a difference which type you use for extract brewing? Second question: My tap water has a ph of about 8.2 to 8.5. When brewing all grain I will add about 30% distilled water to lower my mash ph. Does this help? I am a total dummy when it comes to water profiles. I try to read the posts on water profiles, but it totally baffles me.