I am so glad that the two shining examples you told of are indicative of everything else in the world. I have never gotten sick off of mountain water, and I have been all over the world in places you cannot even conceive of. I await your troll response.
You neglected to point out the most obvious thing: Coffee tends to be made with boiling hot water, which kills most if not all bacteria.
No its not, unless you are using a cheap $5 coffee pot/maker. Most expensive coffee makers use pipes that run next to the heating unit to make the coffee instantly hot. In order to make bacteria filled water safe to drink, it has to have a rolling boil for several minutes, even after that, it still isn't safe because you have to let it cool and then decant the water from the top into another container to avoid any sediments that fell to the bottom from getting into what you are going to drink.
I am pretty sure I can conceive of Mexico... so go there, drink some water from a local water source, and then tell us how the diarrhea feels. Also, look up trolling because it doesn't mean what I think you think it means. Then look up the TOS of Neowin regarding calling people trolls on here
. If you want an example of a troll, see .Neo's comment about elementary school.