1 It's not clean
In some countries, tap water is not clean and it is advised to not drink from it.
2 They don't like its taste
Some people don't like the taste of tap water and prefer the taste of bottled water.
3 They're used to bottled water
Some people are used to bottled water, especially if they've been drinking it for a long time.
4 It makes them sick
Some people get sick from drinking tap water, especially if the water is polluted.
5 To keep their family safe
Some people don't drink tap water to keep themselves and their families safe from any illness that can be caused by the water.
6 They drink filtered water
Some people drink tap water but have it filtered first to get rid of any bad chemicals or dirt.
7 They're advised not to drink it
Some cities advise their citizens not to drink tap water if it is not clean or if it's unhealthy for human consumption.
8 They use it for cooking only
Some people only use tap water for cooking since the water usually boils and becomes safe for consumption.