Unhealthy food preparation

Went there for brunch this morning. My wife had 5 roses tea. Found slime substance in the pot. The manager explains they use borehole water. I asked if the water is filed, treated or lab analysis done of whichich the manager could not respond. After all food preparation must be ecoli, pathogen, pestaside free. Just to add. When we got home my wife has had bad cramps and terrible side effects.