make a little bowl of verm at the top of the cake and put some water into it RIGHT before you leave. It will act as a small tank for it to take water from. At least for a day. One day without water misting wont be a big deal! as the fanning, maybe just leave it open. 

So I recently put my cakes into the fruiting chamber (8 days ago) after they started pinning. However this weekend I have to leave for two days to go to a wedding and so there will be no one to mist and fan the cakes. Do you know of anything I can do? Should I put a lot of water onto the floor of the fruiting chamber or what? Any advice is welcome

Leaving for a few days