Dirty dishes at restaurants were piled high when the water supply at the shopping mall was suddenly disrupted on Saturday night.
Sunday's food at several eateries was still uncooked at lunchtime and customers were being turned away.
Hair salons couldn't wash their customers' hair and had to frantically call them to reschedule appointments.
And with no water in the toilets, the landlord had to find other ways to help shoppers clean their hands.
A pump failure at Causeway Point, from about 7pm on Saturday, caused the water supply to the building to be abruptly cut.
Some restaurants and foodcourts had to turn away customers on Sunday morning as they were not ready for business.
Restaurant employees told The New Paper the taps had stayed dry since Saturday evening.
Said Mr Alvin Chua, 26, an assistant manager of Soup Restaurant: "The water started trickling at about 7pm (on Saturday) and it stopped totally by 8pm. "Till closing time, there was no water.
We threw away the rubbish and had to cover up the unwashed plates."
A 23-year-old assistant manager at a restaurant, who gave her name as Veronica, said she didn't expect it to be so bad.
She said: "The smell was unbearable and the leftover food stuck to the plates, making it harder to wash.