ammunition

An ammunition is a supply of bullets or other things used for shooting.

You might see "ammunition" in headlines about war or gun control debates. But it's not only used that way - it can also mean supplies like food, water, and other resources that help people survive in difficult situations. Think about emergency kits with flashlights, first aid kits, and bottled water - all those things are a kind of ammunition for when bad weather hits or power goes out. In a more general sense, you could say someone's mental energy is their ammunition for dealing with stress at work.