Abstract: Fire-fighting apparatus including a main cistern to be suspended from a flying machine and flown to fires. One or more openings in the bottom readily admit water to fill the cistern and are then closed by a gate until the cistern has been flown to the fire. A second cistern contains an additive to be dispensed into the water to help fight the fire. The dispensing apparatus includes a cylinder, a piston in the cylinder, and a piston driver connected to the suspension apparatus. A draw-spring pulls the piston toward the bottom of the water cistern, and the gate is connected to the piston to be closed to seal the cistern when the piston is drawn toward the bottom of the cylinder. A first conduit and first valve control the transfer of the additive from the second cistern to the cylinder when the piston is moving downwardly. A controllable valve and second conduit allow the additive to be transferred from the cylinder to the water cistern when the apparatus reaches the fire area.