100% tap water here, very hard but good for brewing. No filtering but i do use campden tablets for chlorine/chloramine
If I remember to start ahead, I use my own filtered water. If not, and that is usually because it takes 8 hours to get 2.5 gallons, I use "drinking water" from the grocery store.. It has some minerals added to it, that are usually good for beer. I find "spring water" sometimes is too pure, or void of minerals. I feel if it doesn't really taste great (too pure), it doesn't make the best beer either.
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