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Hospitals worldwide are short of saline. We can’t just switch to other IV fluids – here’s why
(theconversation.com)
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Sterile environment and processes, mostly.
Salt and water are surely relatively cheap (although salt from your kitchen and water from your tap won't do, you need chemically pure salt and distilled water).
You can make makeshift saline by mixing regular salt in distilled water and autoclaving it at 120°C and 1,2 atm for 30 minutes, but this is not hospital-grade.