That thing is known as Taweez.
Wikipedia article: https://en.wikipedia.org/wiki/Ta'wiz
Well they actually really are Quranic verses, but they are used in a very bad manner, do you believe that drinking the verses of Quran would make you a mother of a son? I don't think a Muslim would believe in that. He would infact recite the Holy verses many times a day, rather than drinking them all.
It doesn't work! Taweezat are a work of street side uneducated people who, just for earning their own life, make fool of the people with some money! No offence, I don't mean to mention your aunt here, but yes, people who have lost their faith in Allah do such things.
Instead of going to a street side Baba for a Taweez, people can offer their prayers 5 times a day, to get their wishes fulfilled instead of drinking those Quranic verses.
I want to answer your question with a question.
Would ink, when drunk, purify your soul or would it go to your stomach and make you sick?
Islam teaches us to pray to Allah, to get help in our daily life. But these taweez would make us go to Baba to get the help. Is that allowed in Islam? No it's not, you need to ask Allah for help, rather than using these methods. They are haram, and are considered as Shirk, for you believe that someone other than Allah can help you survive or pass the hard time!