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The same reasons why hospitals don't produce their own medical supplies period? A hospital is a hospital and specialized in doing what hospitals do: Treating patients.

Manufacturing IV solutions is something that requires a clean room laboratory, with its own set of stringent requirements and doing it cost-efficient means doing it at scale.

Making saltwater doesn't require a cleanroom.

Go make some, and shoot it into yourself.

Actually, don't, you'll probably injure yourself.

That's happening.[1][2] A group of big hospitals is creating their own generic drug company to supply routine items at better prices.

[1] https://www.npr.org/sections/health-shots/2018/09/06/6449359...

[2] https://civicarx.org

They are only forming a purchasing consortium to get in front of the line of other buyers or force bulk discounts. If they don't want to build production capacity themselves they could purchase an existing facility, but they don't.

There was actually a story arc about this specific concept in the TV series, "The Resident."