We had a similar situation in the UK where most of the emergency supply of masks, etc. had expired when covid started. The obvious way to handle this seems to be to make a deal with a big wholesaler or wholesalers where the government pays them to maintain a much larger buffer than they normally would. This would ensure the stock was always being rotated. The pre-covid scheme of paying some randoms to keep a warehouse full of mouldering stock seemed doomed to failure.