Settlers can drink unpurified water perfectly fine. There's no rush to purify water. Purified water just has longer buff durations. As long as you have any water around, your settlers should not be dying of thirst. Later on in development, I will add some long term affects of only drinking unpurified water, but right now you are fine.
That being said, I'll try to make it a bit easier to obtain purified water. I won't be bringing back the campfire room, but I'll see if I can make it easier to make in the kitchen. Maybe without needing a cauldron.
As for why I removed the campfire room. Simply put, it was a weird 'room'. It didn't fit and I was struggling to come up with other reasons to keep it around outside of purifying water. A lot of its uses were redundant with the Kitchen or other rooms.
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