Sample note suggested by pph for the authorities: (MUST BE hand written!! )
Method and cause of death:
Self-administered dose of ___________, _____grams, obtained online and ingested at ___am, on __________ 20__.
This action is entirely my own, with NO ONE having advance knowledge of my intention and NO ONE giving me any assistance. I understand the consequences of this action and the reasons for it are stated in the attached signed and dated document entitled, "Reasons for Voluntary Self-Deliverance/Exit".
Signed _____________________________________ on ____________________________
Can type your reasons if you want, then sign and date it. (Personally, I would leave special notes for my loved one(s).