Having furnishings extensive enough to avoid all of the logistical problems involved here would mean basically being in an entirely different situation, because you need quite a lot to have 25 people not stepping on each other's toes when all each of them has individually is a tiny bedroom.
Not because it's the source of the mold. Even if it's a double-fridge, with 25 people you're probably going to get it hopelessly filled.
So, have multiple refrigerators or a larger one? This problem is made up
Having furnishings extensive enough to avoid all of the logistical problems involved here would mean basically being in an entirely different situation, because you need quite a lot to have 25 people not stepping on each other's toes when all each of them has individually is a tiny bedroom.