It's been a while since I played This War of Mine (probably like a year or so).
I do remember that last year there was a mod floating around the Steam Workshop titles "Quality of Life" or something to that, that not only slightly increased the stock sizes but also added new features like more cooking options, unique loot and so on.

Unfortunately I don't see it anywhere in the Workshop now. I suppose the creator deleted that mod. If so, I do wonder why and if there's any "copy-cat" mod that still exists or functions in the similar fashion. (and if it works with Children DLC and Anniversary patch)

Cheers.