Almost all of the coffee and tea that prisoners get, they buy for themselves at the commissary. It's true that the prisons cook up a brew that's supposed to be coffee, but few persons would drink it of their own free will. It's so bad that the guards have special coffee prepared for them at taxpayer expense. But, there I go again, clouding the matter with facts. Serafini isn't troubled by a few facts.
Milk is more expensive than coffee.
It spoils easily and it often causes health problems in older men. Replacing coffee with milk would add a million bucks, not save half a million. Ditto for fruit juices. The water in most of the prisons is unsafe because of the high content of lead it contains from the lead solder used on the plumbing and from other filth. Serafini's coffee-mania is not his only stroke of genius.