I'll always recall excusing myself from the table at an upscale restaurant in Ensenada to go to the men's room. Our table had a carafe of crystal clear water and it also had been "sealed" with a shiny metal cap. Nice, I thought, that they would be so concerned for the purity of the water served to us.
I was directed to the men's room and as I passed a kitchen area I observed two very young men filling similar carafe's...directly out of a rusty spigot and neatly sealing them with those shiny caps.
So much for pure thoughts. "No problema".