Hello,
the case is as follows:
Few drops of phenol accidentally in 1 liter of milk laying on the table.
My mom kept that milk aside and was going to throw away that milk after washing hands, but meanwhile my brother not knowing that drank a glass of milk and left for office.
Usually, he leaves after breakfast, but today he was getting late therefore, couldn't have breakfast.
Symptoms as asked on phone: A little bit of vomit kind feeling but not actually vomiting, a little bit like he wants to poop/urinate.

1)What should be the symptoms and first aid.
2)Can we drink water or milk?
3)Can urinating lessen the effects or poisonous elements by way of urinating?

Thanks and best regards.