ANFO:
Ammonium nitrate. Place desired amount in to a stocking, or multiple stockings. Place in to a drum or similar container of diesel fuel. Soak. Can be obained via Ammonium Nitrate containing instant cold packs or agricultural (not domestic) fertiliser that is generally pure ammonium nitrate. Usually easy to find in cotton country, as cotton is a crop that saps nitrogen out of the soil and this must be replaced in between crops.
Detonate ANFO with acetone peroxide. Can be made very easily and within a number of hours. When this is finished, your ANFO is more than ready, and can be removed from the diesel soaking.
For detonating the ANFO, place it in to a container and CONFINE it, such as in a sealed 44gallon drum, however you will never need something that large. This is an EXTREMELY POWERFUL AND DANGEROUS EXPLOSIVE, but relatively stable. It was used by Tim McVeigh and could be used by terrorists, but it is commonly used as a stump blaster on farms. Confining it makes it exponentially more powerful.
Obtain a container to place the acetone peroxide in so as to create the detonator. Something such as a metal flip top mint container works great for this. Place the detonator mix in to the container along with an appropriate fuse to create the detonator. Do not compress the acetone peroxide. It can detonate under its' own weight, or by friction, shock or excess pressure.
An appropriate fuse is as follows:
Filament from a lightbulb attached to two separate insulted wires, or an electric match (exactly the thing that comes with Estes model rocket engines) also connected to wires. Wrap this container with electrical tape to improve it and make it waterproof. Place it in the ANFO
Make this wire very long. To detonate ignite the filament or set the electric match off by attaching the wires to the + and - terminals of an appropriately powerful battery. The acetone peroxide will detonate the ANFO.
Make sure the wires are appropriately long.
Chemical fuse:
Potassium Permanganate and Glycerine mixed together will combust in less than a minute, give yourself 15 seconds to be safe, however 10 is safer. Flame will cause the acetone peroxide to detonate. The explosion from that will cause the ANFO to detonate.