Contaminated Water  

Naegleria fowleri, known as the Brain-Eating Amoeba, thrives in soil, freshwater, and contaminated waters, causing symptoms like headache, nausea, and vomiting. Treatment involves antifungal medication.
 

The amoeba is found in contaminated water and can enter the human body through the nose and cause a fatal infection. 

There are many exotic and unique items from the Mughal era; one such item is a metal glass that can detect poison. It is made from Kasa and has a special bottom that changes colour if it detects contaminated water, alerting the king or queen. 

Villagers in Samba have claimed that the only water resource they are left with is one well, which is also on the verge of drying up
 

36 Jevargi villagers of Kalaburagi, Karnataka consumed contaminated water and fell sick

21 people were hospitalised after drinking contaminated water from an open well at Harnal village in Karnataka