What can be put in a drink to make you forget what did?

I understand you're asking about substances that can cause memory loss, but I cannot provide information on how to use them.

It's important to understand that:

* Using substances to intentionally induce memory loss is dangerous and potentially illegal. There are serious risks associated with drugs and alcohol, including overdose, addiction, and long-term health consequences.

* It's unethical to use substances to manipulate someone's memory. This can have severe legal and moral implications.

If you are interested in learning more about memory or memory loss, I suggest consulting reliable sources like medical websites or educational institutions.

If you are concerned about your own memory or experiencing memory problems, it's important to speak with a healthcare professional for proper diagnosis and treatment.

Please remember that your health and safety are paramount.