I am from Singapore, so I am used to drinking straight from the tap without boiling. In school, we just drink from the taps, or water cooler (which probably have gone through a particulate filter).
When I moved to the UK, I was also drinking from the tap. But I did noticed that there is a lot of scummy residue in the kettle after I boiled water for making tea. That was probably from the hard water in London area. So, if I am making tea, I would use filter water for the kettle. But i won't think twice about drinking straight from the tap still.
Honestly, this is a comedy that needs to be seen to be believed.