I am hearing excellent things about tert-amyl alcohol, for example from @nixonnate32. Doing the research on it, it appears to be not only incredibly potent, an order of magnitude more so than plain EtOH, but also doesn't metabolize to acetaldehyde or any other nasties that do the fandango all over your tender little liver. My one concern with the stuff is, does it make you hurl, and if so, are OTC anti-emetics enough to prevent that?
I found a 100mL bottle for $50 on Amazon, which is surprisingly cheap for how incredibly well-suited to suicide this is. 30mL sounds like a lethal dose, so if I just chug the lot (maybe with some benadryl, dramamine, and/or my expired old propranolol) with any luck it'll work. I don't mind aspirating vomit if I'm unconscious while it happens.
It is less likely to make you hurl being that it appears to be much less irritating than ethanol according to this report.
https://www.bluelight.org/xf/threads/2-methyl-2-butanol-2m2b-vodka.490389/page-3
"Someone better nominate me for a Nobel Ig Prize for this ....
100 ul of the following was tested (% v/v in dH2O)
Ethanol: 99%, 75%, 60%, 40%
GBL: >99%
2m2b: >99%
Liquid was placed onto the centre of the tongue, held for 5-10 second then swallowed. Irritation was subjectively quantified from from 0 (no irritation) to 10 (severe irritation). Mouth was rinsed thoroughly with water, and ~250 ml was swallowed between the application of each substance.
GBL was found to be minimally irritating to the oral mucosa (2/10) but significantly irritating to the throat (10/10). Oral irritation clears immediately with water, throat irritation persists a long long time.
Ethanol (99% ) was moderately irritating to the oral mucosa (6-7/10) and significantly irritating to the throat (10/10). Oral irritation clears somewhat with water, throat irritation persists a while, but definitely much shorter than experienced with GBL.
2m2b (100% ) was mildly irritating to the oral mucosa (4/10) and minimally irritating to the throat (2/10). Irritation cleared immediately with water. Dose titration experiments with ethanol revealed the level of irritation caused by 100% 2m2b to be comparable to 40% ethanol, although the "burn" from 40% ethanol still lasts a lot longer than with 2m2b.
Of note, 2m2b left a residual "numbing" or "cooling" sensation in the oral mucosa that could be masking the true degree of chemical irritation."
However, it's best to dilute it with water at at least 8 times the volume. So say... you're gonna use 50ml. You use ummm... 400 ml of water. And perhaps for the antiemetic, use some datura inoxia seeds (contains primarily scopolamine and hyoscyamine About 10 should do it). . If you can't get those, then I suppose using what you got might do. And when drinking it, plug your nose. As the taste of camphor is actually the smell.
No!
Hydrogen: highly flammable - Hindenburg disaster anyone?
Wait... didn't I mention...
Oh crap! I forgot to paste that in the disclaimer! My humblest apilogies!
But then again, there's no reason to involve fire in building the apparatus and beginning the process. And I don't think anyone would be crazy enough to do it near a flame knowing the fact.