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This may be the most simple furnace for melting zinc there is. That is other then just a big pile of coal. I melted the zinc using a charcoal chimney that is normally used for starting a grill. I have always loved this product for starting my grill beacuse I always have newspaper around and don't need to buy fluid but now I am even happier. I just used a small can for the crucible and a larger can for a lid.
I pinched the can a little to make a nice pouring spout.
Zinc ingots are available at rotometals.com
I don't belive this is hot enough for aluminum but i did not have any on hand today.