Resource Underrated/Not known suicide methods.

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Stopping eating and drinking. Some people refer to it as a dignified death. It takes up to 4 days but it depends on the body ( weight, health...). For the first two days the desire to eat and drink is irresistible but afterward you won't feel a thing. It is a peaceful method, a lot of people experienced a smooth and painless transition.

The main drawabacks of this method is that it is long, draws a bit of suspicion and if you are found you will be hospitalized and forcefully fed, you may suffer minor brain damage after it.
Another one is that it takes a huge amount of determination and will to keep through it. ( but bare in mind that the desire to eat and drink will decrease greatly).

Seems like the ultimate backup method. Its reassuring that there are methods like this that can't be stopped so long as you are alone, and have time.