Yes, this one! This error is from version 42.3 onwards

Will definitely share the save file. I checked the save file, and it's currently around 70MB (uncompressed) and 16MB (compressed). But I'll find a house to do the test on first, then I can share the file with both locations built up. Hopefully that clears up what the issue is.

After the test, you could send the compressed savefile so I can try loading into it and do testing on the specific sink location as well.

I've not tried moving all the sinks to different locations. But when in -debug mode, I did delete the original sinks at location 1 & 3, and spawned in sinks from the items list, and the issue didn't change. Because the water is on, the sinks at 1 & 3 plumb fine to what can be considered "water mains". But only the sink at location 2 sees the rain barrels positioned above, since it's the only one which offered an additional "plumb sink" option, which would be to the rain barrels, in the event the water does shut off. So my assumption is that the locations are the issue, since I have spawned in alternate sinks.   My only other test I was considering, is going to build the same type of setup in any of the adjacent houses (with a similar floor layout - i.e. 3 sinks on ground floor), and see if the issue can be replicated that way. I'll only try this later today, or tomorrow, and provide feedback on this test.  

Very very old save, this is cumulative bugs all the way from 42.3 or something   You can fix this by going into debug mode and adjusting the nutrition and hydration meters manually, this should reset it for this character