For me it's nembutal, but I already have a method, and all the ingredients, that have practically the same results as nembutal. Below is the method:
The method is, basic:
phenobarbital -> 20 grams
Chloral Hydrate -> 20 grams
Morphine Sulfate -> 3 grams
Alcohol -> 1 or 2 cups (i will drink wine, maybe)
With this method you:
1 - Lost consciousness within 3 to 5 minutes
2 - Go into a coma within 5 to 10 minutes
3 - Die into 60 to 90 minutes
4 - Painless, exactly the same as nembutal
I'll do it in the bathtub, and when I lose consciousness I'll drown in seconds to a few minutes, painless, like nembutal
Below is the link about the method: