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Looks like one of you got a bug and passed to the others

Sounds more like a stomach flu to me, which is often spread throughout a household via contaminated surfaces.

I'm here to second that drinking the local water in a new place will loosen you up even if it is clean.

You were all in the same space, though, right? It could have been something contagious.

Time to split the family up into a control and test group. For science.