Final answer:
The symptom of rice-watery diarrhea after drinking contaminated water is indicative of Cholera, which can cause severe dehydration.
Step-by-step explanation:
The symptom described as profuse, rice-watery diarrhea with some nausea and vomiting 2 to 3 days after drinking questionable water is indicative of Cholera. Cholera is an acute diarrheal illness caused by infection of the intestine with the bacterium Vibrio cholerae. The key signs and symptoms of cholera include watery diarrhea, which can quickly lead to severe dehydration and electrolyte imbalance. This condition requires immediate medical attention due to the risk of severe dehydration and potential complications.