Read the article. They’re paying for bottled water. They have access to regular tap water, but some people are saying the tap water in these very old prisons isn’t fit for drinking.
I don’t think the article specifically says, but most prisons in the U.S. are privately owned. I can only imagine that’s more the case in Texas than it is the nation as a whole.
According to this, Texas has ~7% of their prison population in private facilities. The national rate is ~8%.
Private Prisons in the United States – The Sentencing Project
Twenty-seven states and the federal government incarcerated 90,873 people in private prisons in 2022, representing 8% of the total state and federal prison population.