This is my horrible death plus corpse disposal all-in-one solution.

Basically, you need an electric chair, 20 pounds of thermite, a plastic washbowl, 10 feet of sparkling wick, and a remote control (the trigger mechanism.)

You hang the washbowl full of thermite above the electric chair and interconnect them with the wick. Then you strap yourself to the chair, and hit the remote.

What happens next is this: you start being electrocuted while the wick lights up and burns towards the washbowl. By the time you are next to dead (or dead already, if you’re lucky) the thermite ignites and pours over your body and chair annihilating every bit of them.

Have a happy suicide.