While the OP hasn't replied to my questions on what temp he expects to be able to use the dev at, it is clear from his post that it is low temps that the dev needs to operate in.

As I said, I have difficulty in imagining a situation where both the room temp is very low( indoors but no room heating at all?) and he has no means of heating the dev. I suppose an unheated room in winter with only a cold tap and no means of heating water at all might be that situation but we won't know until he tells us.

Maybe a mountain hut with no firewood and only snow for water? In which case are timber wolves any good as darkroom assistants?