This lamp uses bacon fat for fuel. I guess you will need about a quarter of a cup of fat.
To obtain bacon fat...
You can simply collect the fat left in the pan after frying your breakfast bacon until you have enough,
you can do what I did and trim the excess fat off some raw bacon and fry it on the stove until all the fat turns liquid. This is a very simple process, but be careful not to burn the fat or yourself. Everything gets very hot.