I know that the purity zones were removed for a reason but the the present system is a bit extreme in it's own right.
First
At this point there''s no way to get meat with any purity witch makes high humor characters mostly vegetarians, adding some type high purity meat would be greatly appreciated. I know there is supposed to be a husbandry system en route but I remember once you could also raise the purity of turkeys and it would be great if we had that again.
Second
What about watter? If I remember from h&h if there was an item with no q then it would simply not be taken into account during a q calculation an example despite what the rob wiki is saying cave clay did not influence the g of bone clay, in the same fashion a quern never influenced flour. So either remove water from purity calculations all together or give us some way (like wells for example) to obtain high purity water.
It would make purity grind a lot less frustrating experience.