No.Potable water and “blue (toilet) water are separate systems. Please don't drink the potable water either, it's mostly to wash your hands. Ask for a bottle of water to drink instead.
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Carrying an open container of alcohol in a public space, such as public transport, is also an offense.
If you're on public transit and have to take an important call that can't wait, keep it short and as quiet as you can. Don't get overly personal in your conversation either—no one needs to hear you describe symptoms to your doctor or tear your significant other a new one on their morning commute.
But how safe is a bus? According to the National Safety Council public transportation is 10 times safer than other vehicle travel. The NSC study found that people who used buses or trains 40 times per year were 20 times less likely to be injured in a crash. Buses are safer than most modes of transportation.