Item combinations
Certain items can be combined together to create new or improved items. In the case of weapons, certain ones need to be loaded with ammunition to be effective.
Known combinations:
Rotting Log + 
Box of Matches = 
Torch
Burnt out Torch + Box of Matches = Torch
Water Ration + 
Plastic Bag = 
Water Bomb- Water Ration +
Water Pistol (Empty) = 
Water Pistol - Water Ration +
Plastic Bag and Semtex = 
Exploding Water Bomb - Water Ration + *
Bag of Cement = 
Unshaped Concrete Blocks - Plastic Bag +
Duct Tape + 
Compact Detonator + 
Semtex = Plastic Bag and Semtex 
Battery-Launcher 1-PDTG (Empty) + 
Battery = 
Battery-Launcher 1-PDTG
Crate Lid + 
Twisted Plank = 
Solid Wooden Board