I can't stress this enough. try peppers, the more natural the better.
Habaneros which are one of the hottest arounds will give it to you good better than any gay hot sauce in a bottle. If you manage to get your hand on some (I can't find good ones here in Canada) boil them, then pure(sp?) them into a sauce add salt, etc. and you are set. If you want to take some of the heat off add tomatoes.