Distilled water always works just fine, but some people can use bottled, tap, rain or some kinds of filtered water. It depends on what is in the water, some minerals can cause problems, and I have read that people don't want to use rain because they live in a place where the rain is very polluted. Where I live (in the UK) my tap water is very safe to drink, but if I use it for soap there is no lather...it all depends where you are and what is the water sources. Bottled water can be very different stuff depending on where in the world you live too!
Distilled water is the stuff used in steam irons, but I wanted to point out to people, do not buy perfumed ironing water to make soap, the fragrances in them are not necessarily safe in soap, and it will mess up your own choice of fragrance for your soap.
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