>>3145384drowning is very painful.
it is unknown if dying by falldamage or hanging will give you an immense pain for a short second before you die.
the safes and best way to take your life is to hook a sleep mask to a helium tank and breathe it in. the human brain does not know the difference between helium and oxygen therefore you will not feel pain and your body will simply run out of oxygen, and die peacefully. this does not make your body look ugly in a coffin like a rope does. this does not harm the people finding your body since helium is not lethal to be around, it's only lethal when you replace the air with it.
this is quick, cheap, efficient and generally the best way to kill yourself