And the mustard gas: You can make it at home! That's right, kids! Just do a search on Google and there you go(I'm not kidding. I actually did one. This suggests that the person who set the gas bomb could have made the mustard gas himself.). Note: No links are posted as I failed to get permission from a mod that I asked(I don't blame him/her). However, I will say that one source of this is from Harvard's website.