He drank the water
In the film Walk the Line, Joaquin Phoenix portraying Johnny Cash in the scene of the concert at Folsom Prison takes a glass of murky water and throws it to the ground before breaking in Cocaine Blues. In reality the scene did not happen that way. It seems that Cash did do a comic bit about the water at Folsom Prison in both morning and afternoon shows. I don't think he broke a glass like Joaquin did in the film but he made the a comment to the effect that the water looked like it ran off his guitar player's boots. Either scene made the water quality at the prison appear rather poor. In the video above Johnny does another water bit during the San Quentin concert. Whether the water quality at Folsom Prison was as poor as Johnny Cash suggests, I can find no evidence. However, Folsom Prison is not without its water issues. Back in 2002 there was a sewage spill at the prison which may have contaminated water in the adjacent American River. Tests were made but none proved conclusi...