1/4 coffee grind to 3/4 cold water, stick it in the fridge for 24 hours. Dilute with 1/4 coffee to 3/4 boiling water (it will be less bitter than brewed coffee)

1/4 coffee grind to 3/4 cold water, stick it in the fridge for 24 hours. Dilute with 1/4 coffee to 3/4 boiling water (it will be less bitter than brewed coffee). Now you just need to find something to boil water that isn't made of plastic.