This is similar to, but more general than this question and referring to from scratch buildings.
I've seen Create an Oasis with Greywater and it's an awesome resource to build a DIY system.
The question is, how are new homes built from scratch that are trying to reduce their water impact doing all this, while remaining comfortable and usable by everyone? Can you point to existing systems used to build new homes that are just as comfortable as regular homes but that reuse the greywater?