What are the rules to put out a fire using 'Create Water'?

[harmor]

How fast and when is it futile?

[LazarX]

It's kind of a situation where it kind of is a DM adjutication matter.

Think of it this way, putting fires out with create water works pretty much like a standard bucket brigade with a bit less walking. If the fire is small enough to put it out with a bucket brigade then you're good If it's a 3 story inferno... then more heroic measures are called for.

[Damon Griffin]

If it's a small fire, it will also depend on what kind of fire it is. Trying to douse a grease fire (or flaming oil) with water is a bad idea as it may cause it to spread.

[Count Duck]

Page 262 PRG. (Create Water)

The spell says that the water dissapears after one day. For the rest it can be cast and used like the players want.