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Nothing can be done afterwards, other than watch for any effects of drinking contaminated water. You may experience immediate gastrointestinal and stomach illness, such as cramps, nausea. vomiting, diarrhea. Should you believe you've been exposed to diseases that are waterborne (e.g., dysentery, typhoid, cholera, Guinea worm, cryptosporidium, cylcosporiasis, giardiasis, hepatitis E), seek medical help.