Start again, go the the cottage, take the key, then go to the hill, take a stone, then the lake, get water, then go to the forest to put the fire out.
Say aye if you agree with this plan. It may not be the right thing to do, but even if it's not you might learn something along the way. Plus it will speed things up.
I tried to do this part last night. I failed. I think I know where I went wrong, although I'm not certain.
