There are some excellent resources about this kind of stuff on-line, mainly hosted on servers by people who think it's funny, people who like messing with explosives, and paranoid fucks who seriously think that they will need to ever kill a lot of people with fun powder they can make themselves.
Search around and you'll find it, I believe those books also detail how to extract potassium nitrate from the ground, and more of that kind of stuff. Build highly deadly stuff with very little resources and all.
But don't go blaming me if you blow your hand off.