Dear Massi, I have a Muslim colleague who does something a bit strange.

I understand why he takes his water bottle to the toilet, which actually I think is a really good idea.

But then he comes back to the desk with the bottle, he fills the bottle with water and drinks from it. I am really concerned about this.

I think it's really unhygienic.

Is this normal?

Massi says, It certainly is not normal to drink from the same bottle that has been used to cleanse oneself in the bathroom. 

As concerned as you are about your colleague's behaviour, his bathroom etiquette is his own business.

As unhygienic as it seems, his unusual behaviour does not impact you directly.

Bringing this up may lead to an unnecessarily awkward environment in the office.