How to make your own charcoal
This is a YouTube video on one way to make your own charcoal at home: https://www.youtube.com/watch?v=dNygH_09CwQ
Now one can use the old one gallon paint cans for other purposes, too. For example they can make a nice chamber pot.
And there are many ways to make charcoal at home. The volume of use will often be a deciding factor in the method you use.