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FIRE/HEAT

One can get it through:

- Friction (examples: fire strikers, stick and hole, cotton with wood cole,  )

- Compression (examples: fire piston, forged iron)

- Concentrating/focusing of sunlight in one  point (examples: using lenses, mirrors, polished spoons, transparent plastic bags filled with clear water and shaped into lens form)

- Chemical reactions (examples: potassium permanganate and glycerine, mineral oils on rigs through polymerization and many others which produce enough heat to start a fire. 

Some reactions expand explosively, stay ready and protected.

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