Suitable Drinking Water

Hello all. I am new to the forum, and I wanted to ask about drinking water. I read that you aren't supposed to use tap water for chinchillas without purifying it in some way (e.g. boiling it). I'm wondering if anyone out there does use tap water without purifying it. Also, for those that do use tap water and purify it, what steps do you take? Do you just boil it? How long do you boil it? Does anything need to be added this way?

Thank you in advance.