Charcoal is usually obtained from a hard wood, charcoal is produced by slow combustion in a relative absence of oxygen. If you do not have any available, in an emergency, you can burn a piece of hard wood and scrape or chip the charcoal from the charred wood. After moistening it with water, force it through a food grinder.
Commercial source is usually made from coconut shells. (burnt toast or charcoal briquettes are not charcoal!) Treatment with superheated steam can produce activated charcoal, which is capable of much greater adsorptive effect. This is because more surfaces of the charcoal have been exposed. The surface area of charcoal is astounding for it has millions of micropores with surface areas ranging from 400 to over 1,800 square meters per gram! There are 50 million charcoal particles in one pound!
Websites showing how to make it:
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