Show me where disposable or other non-capital expenditures to provide existing services are limited.
By the checkbook. I'd add a 'dumbass' after the comment, but I'm sure you know perfectly well that buying supplies in excess of anticipated need is stupid. Manufacturing supplies in excess of anticipated need is stupid.
Personal protective equipment is in short supply for EXACTLY THE SAME REASON YOU CAN'T BUY TOILET paper right now (with the exception that there aren't a huge number of unwiped butts).
Ramping up production requires the entire supply chain and a bottleneck anywhere in the chain limits capacity to deliver end product. I know I'm stating the obvious, but sometimes that's what is needed to provide perspective.
Disaster planning generally accounts for localized events like weather, or mass casualty accidents/violence where the elevated need is less than 30 days. By the end of that time, the treatment and inflow of supplies _from unaffected areas_ have met the need or stabilized. It is not feasible to try and stock supplies for a once a century world wide pandemic where there is no unaffected area to draw from.