Purified Water should be usable in place of dirty water when you need boiled water.

We've brought this up to the development team a few times before. It's been about a year since I last mentioned it so my memory could be a bit off here, but it was explained to me that the way Purified Water and Dirty Water are implemented, they can't safely or quickly change it so you can use Purified Water while crafting food instead of Dirty Water. I don't want to say it'll never be a thing because you never know with development roadmaps, but right now my understanding is it is too involved and risky to the crafting system to touch right now.