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I've been to many places where drinking water is best limited to bottled water...
..BUT.. I have never worried about ice (or what water plates were washed in, or eating salads) or any of that...
Never been sick from any of that... not identifiably anyway..
I am amazed and impressed that when in a foreign country folks are able to determine that they got sick specifically from ice in a drink, or having cleaned their teeth using tap water!!
It's more likely the change in diet that gives me "the gyp"...
It can be very easy to determine a specific instance that causes you to be sick - a serious case can be within 30 minutes of eating. But it might be herder to determine which part of the meal made you sick (salad, the ice, the ice cream or the curry). For the nasties with a longer incubation period it them becomes a case of 'what did I eat that you didn't?' scenario till it's whittled down to the most likely culprit.
One suspects they are assuming that because they had ice in their drink... and they got sick.. that it must be the ice. Isn't that reasoning one of the most common logical fallacies?
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Much like when you've had a big night, wake up crook, and it's the dodgy kebab at 3am that's done you in. Not the 2 beer jugs, 8 spirits and uncounted shots. Definitely the kebab.
Failing those methods there is also the Bear technique for administering putrid water by enema.