It is surprisingly easy to make your own fuel gel. All you really need are three ingredients: eggshells, vinegar and alcohol. Gel fuels like sterno are useful because they provide a clean burning flame with minimal risk of spilling the fuel. Making a gel fuel requires encapsulating a combustible liquid inside a gelatinous solid. In this case, I make the gel by first creating a solution of calcium acetate, the primary biproduct of the reaction between the calcium carbonate in eggshells and the ac