Talking edible stuff...and back on topic.
I see salt is only actually used for beef jerky, and sugar only used for fruit pie...I get the feeling they are a bit underused.
I suggest adding salt water and candy (salt+water and sugar+water+pan/pot respectively) for easy extra uses. Jam would be an alternate way to use fruit+sugar as well (it's one of the traditional ways to conserve fruit after all!).
Since milk expires fast, it can be interesting to generate "farm buildings" outside of towns. You might find a few (emphasis on few) surviving cows from which to obtain meat and skin, or milk. Some of that empty terrain would be filled with a few fences and a little factory building. It'd also be fun for someone to die protecting his/her cow from the hordes of zombies and beasts.
An alternative would be a poultry farm, but there aren't even eggs in-game, so not really a concern.
Another alternative would be horses. Both the meat and milk are edible. And can be made to spawn wild like deer, so no need for infrastructure or pollute the building list. Not really caring about riding horses though, sounds counterproductive in a monster apocalypse.
After getting milk, a good caution would be to use a few hotplate charges with it to sterilize.
Also, one last thing. Drinking water from a toiled should give a morale penalty. It's implied they are drinking from the lower part because of the 100% poison chance (a character with an intelligence over 10 should be using the water tank above, though). You can also make "dirty toilets" from which the character will REFUSE to drink from, if the game is going to continue doing it the silly way. (it doesn't need to be sh*t-stained, can be dirty with other stuff like mold, which is possible if it's been static for long)