In my current game I´m not able to produce something simple as Fuel. I bought the schematic, have Brewers Yeast and Wine - no chance. Bullets work perfectly from Salpeter and Charcoal and are in the same group (explosives) as fuel. Molotov cocktails created from fuel and rags work perfectly, too. I even bought 3 books of Explosives to get my skill temporarily up - "you lack the expertise to combine these items"... Spoiler What am I missing here?