An explosive grade munition can be made from fertilizer grade ammonium nitrate and either fuel oil or a mixture of equal parts motor oil and gasoline.
When properly prepared, this explosive munition can be detonated with a blasting cap.

Materials required:
-Ammonium nitrate (no less than 32% nitrogen)
-Fuel oil or gasoline and motor oil
-Two flat boards (at least one should be comfortably held in the hand)
-Bucket or similar container
-Iron or steel pipe or bottle, tin can, or heavy walled cardboard tube
-Blasting cap
-1/4" wooden rod
-Spoon or similar measuring container

Spread a handful of the ammonium nitrate on the large flat board and rub vigorously with other board until large particles become fine powder. Proceed quickly to step 2.
Mix one part fuel oil with sixteen parts ammonium nitrate in dry bucket and mix thoroughly with wooden rod. Store in waterproof container until ready to use.
Spoon the mixture into iron or steel pipe.
Do not pack too tightly. Insert blasting cap beneath surface of explosive mix.