can you proof read please
The first time most Canadians really started to think about the safety of its water supply was in 2000, when seven people in walkerton ,Ontario , died from drinking tainted tap water. Thousands more was taken ill. All of a sudden, we begun to realize how crucial a safe, clean supply of water was. But we will all have to pay more close attention to the way we use water in the future. For example , learning people to use a glass of water to brush his or her teeth , instead of letting the tap run, would save 14 liters of water per person every time.
The first time most Canadians really started to think about the safety of its water supply was in 2000, when seven people in Walkerton,Ontario, died from drinking tainted tap water. Thousands more was taken ill. All of a sudden, we began to realize how crucial a safe, clean supply of water was. But we will all have to pay more close attention to the way we use water in the future. For example, teaching people to use a glass of water to brush their teeth, instead of letting the tap run, would save 14 liters of water per person every time.
Sure! Here's the proofread version of your text:
The first time most Canadians really started to think about the safety of their water supply was in 2000 when seven people in Walkerton, Ontario, died from drinking tainted tap water. Thousands more were taken ill. All of a sudden, we began to realize how crucial a safe, clean supply of water was. But we all will have to pay closer attention to the way we use water in the future. For example, teaching people to use a glass of water to brush their teeth instead of letting the tap run would save 14 liters of water per person every time.
Note: I made a few changes to improve grammar, punctuation, and sentence structure. Additionally, I changed "his or her teeth" to "their teeth" since "their" is a gender-neutral pronoun that can refer to both males and females.