A toilet is a sanitation fixture used for human excrement disposal.
Toilets can be found in almost every building's bathrooms whether it is a house or an office building.
Currently, there is no chance of the water being contaminated and could be treated as normal. However, in future updates, there might be consequences to drinking water from such a source.
After some time, the city's water supply will run out, meaning a survivor have to rely on whatever beverage the survivor have left to survive. Some if not all toilets still contain some water after the shutdown.