Is it normal to stay smelly even though i know i stink

Is it normal to have these behaviours? Please comment and let me know.

i have a friend and she has very bad personal hygiene. First, she does not brush her teeth regularly. When she wakes up, she does not brush her teeth. When she goes to bed, she does not brush her teeth. Her teeth are yellow, gums are very red, and she has very bad breath. She uses mints to get rid of her bad breath.

Is it normal to drink less than 5 cups of water daily? Does this contribute to smelly BO? My friend does not shave her armpits until recently. But her BO is still very strong and smelly. Is it because she has not been drinking enough water? Her pee is also very smelly.

And is it normal to only use water to wash yourself after peeing and shitting instead of using toilet paper to wipe your backside? My friend does this all the time and her underwear has a lot of black spots. I suppose it is due to the method of washing her backside instead of cleaning it with tissue paper. When her backside is still wet, she puts on her underwear immediately. I think that is why she has those black spots on her underwear.