"The state raised the price from $4.80 per case (24 bottles) to $7.20…

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https://www.tpr.org/criminal-justice/2023-07-20/texas-charges-prisoners-50-more-for-water-for-as-heat-wave-continues
"The state raised the price from $4.80 per case (24 bottles) to $7.20 per case on June 27. Commissary vendor Royal Pacific Tea Company requested to raise the prices in March even though it contract was incomplete. The prices were negotiated by the state comptroller's office and appear to be approved by the Texas Department of Criminal Justice.
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About two-thirds of Texas prisons lack air conditioning, and 271 deaths between 2001-2019 may have been caused by extreme heat days, according to a 2022 study published in the Journal of the American Medical Association."

https://www.tpr.org/criminal-justice/2023-07-20/texas-charges-prisoners-50-more-for-water-for-as-heat-wave-continues