It can take between approximately 3,000-8,000 gallons (11,356-30,283 liters) of water, applied directly to the battery, to fully extinguish and cool down a battery fire; always establish or request additional water supply early.”
www.hemmings.com/stories/tesla/
How Many Gallons of Water Does it Take to Put Out an EV Fire?
www.hemmings.com/stories/tesla/