Depends on how hot the fire gets. Even if you could throw large amounts of water on it it generally evaporates by the time it hits the ground.
The best thing you can do is put fire brakes between forests, these can be in forms of open fields, water reservoirs, or planting things that are naturally fire resistant.
If you are talking about your own house then having a water tank and a pump ready to go, maybe install a sprinkler system like they do in any commercial settings if you are paranoid.