Fire safety, what do you use?

[Drunken hobbit]

What equipment do you have for fire safety?
It's coming up to winter here in the South Island of New Zealand. I've just installed a log fire. The chimney has a spark-guard on it, and there's 6 feet of chimney above the skylight hole, but I'm still worried about the roof catching on fire.
It's made of some kind of tarp material. I cut off a section and did a burn test... I held it over a candle to see how well it would burn. Fortunately it charred and shrank, but it was a little difficult to light on fire. By difficult I mean it was in a candle flame for about 10 seconds before I managed to get a flame from the roof material.
So that's good.
I am too tightfisted to buy proper extinguishers... they cost a LOT, or at least the good ones do. Hmm... but what price safety... And I could use it on my boat too.

I'm off grid, so thinking of getting a second-hand 25 gallon-per-minute hand pump (designed as a boat bilge pump) and an oil-barrel of water.
And also maybe a smaller one for inside the yurt, which sprays about a pint of water per stroke. Sorry about this big image size, I'm not sure how to resize hotlinked pictures.

[Jafo]

The roof I have on Pacific Yurt is burn resistant, but the chimney pipe is also higher than the peak of the roof. I have found spark arrestors problematic as they eventually seem to affect draft. I have a decent cap on the chimney and that seems to work well. I inspect the roof under the chimney frequently and don't see even as much as a blemish under it. Of course, I don't have a straight run of pipe either. There are two 45's. The design of my stove also makes it very unlikely any large ash can escape anyway. If I had a fireplace with a straight chimney, I might see more need for an arrestor.

I keep two fire extinguishers in my yurt. One by my bed and one by the range. I also keep a knife on my nightstand so if I had to, I could cut the roof and climb out.