Hate having to annotate explanations to obvious things but I guess it wasn't obvious:
Stock up for the next few months. (after paying for it)
If they don't need/use it, it gets redistributed. (from the local shared storage unit)
Doesn't realy change the second part of my answer though. People could already keep some stock at home right now but most just don't. I don't see how such a shared storage would change that.
Also stock up for a few months is what the government is for at least where I live. [0] Personel emergency supplies are only for the time till the government can start distributing their own stocks.
[0]: https://www.bwl.admin.ch/en/we-advise-emergency-supplies