I gather that the problem is that you have to book soon. I would book a double room as normal, as a single room is not significantly cheaper. Travel is more of problem, but if he normally makes the arrangements, then why not leave him to do it, if you can afford it?
The nearer the time, either everything will be cancelled - so no problem, or it is all on.
If so, either things will be looking safer and you will feel happier about going.
Or, if not, then can you find an excuse, even just that you are 'not feeling very well',
As long as you can afford to risk the travel costs, then I would allow him to go ahead, and cross the bridge when you get to it.