How To Flush Amphetamine Out Of System?

I want to know what will flush ice out of my system in a day or two max I was told niacin an if so what dosage or form would I have to take. And if thus info is not correct what would I need to take or drink to achieve flushing ice / amphetamine out of my system please help me I m in a dire straight position as a friend had put it in my drink know that I couldn t have it because of my random drug screens an this persons reason was beacause everyone else was having fun an I was worrying to much because the believed it would be guareenteed to have been out of my system in a day or two an Tha it wouldn t jepodise my test, but I now risk severe consequences as the result of irresponsibility by a friend an I m desperate for your help as they will not believe that it wasn t self induced ir even knowingly induced please help me.