The article says the water went out at 3:00, not 3:45. The shift ends at 4:45, again from this article. That's nearly 2 hours without drinking water or toilet facilities. That's a fairly long time.

Your also wrong about the next shift and the notification. Again, in this article....

The issue continued during the day shift. ‘They emailed dayshift workers at 7 AM to not come to work when the starting time is 7:45 AM, so many were already on site or on their way to work,’ explains Hannah.   

They sent an email, not a phone call, 45 minutes before the shift started. I'd be surprised if any of the employees checked their email at the last minute before leaving for work. It goes on to say that many employees come from a town an hour away. The email was sent while many employees were already on their 1-1.5 hour commute. The. They told them just go home.

Then, at 12:30, they messaged the employees that the water was on and they needed to be back at work in half an hour or they would not be paid for it.

Your description of events does not at all match what the article describes. Do you really think Amazon's behavior is acceptable ad I and the article describe it?