Water rats

There's always a rat in pirate (siempre hay una rata en pirata):

Chiapas is reporting that fake companies are now selling "pirated" water in Mexico's southernmost state. Impostors pretending to be legit companies fill "garrafones," or 20-liter returnable water jugs, with supposedly purified water. The fraudsters have the same types of jugs and even rip off logos and labeling. While the agua pirata may be safe, authorities say not to buy it. Chiapas is Mexico's poorest and most marginalized state, and access to safe drinking water has long been a problem.