Tap Water.

Our world has been contaminated so long ago due to all the factory and garbage people throw on the street and rivers. In our rivers fishes are dying and the water is being polluted beacause of all the chemical factory disposes on it, rains is getting acid and it is killing trees and begetable. Contaminated water is one of the most common way to transmit diseasses. The most affected are kids, poor people, and elderly  who are more sensitive in those cases. But outhorities seem  not be worrie about that. They know this since the beginning of thie problem they just promise to look for the solution but a the end they do nothing about it. People need to be aware and start looking for a solution all together before our world dies.