I think I would likea new building! mini, small medium and large market. Which is where the beavers get their food. It affect happiness this wouldn't prevent beavers from getting food and things from wearhouses but they would prioritize it. Mini would have 1 item storage small would have 2-4 and medium 5-6 and large would have all things plus larger storage per item. I think it would be best to have workers and all they do is stock the shelves. Aka go get goods. Doesn't have to have a worker though. I think it should be able to store water and coffee as well or in the case of the small one have a specific model for water/liquid. I have no idea if this is possible.