Mine is good to go with water, food, luggable loo, etc. Really hot in there with both adults and 200 lbs of furry dogs! Thinking of having A/C ducted with a shutoff that will normally be kept closed.
Just cleaned ours tonight. I need to get a 9'X6' rubber mat to put over it to keeps all of the leaves and other debris from blowing into it all the time.
I made my daughters sweep out the pine needles and junk they put down the vents to our shelter. All clean and good to go now.
I dont keep much in there because I know several of my neighbors have before and will come again in any real event. I thought about all the things I would want down there but other than lights, H2O boots/shoes for kids and a few other things I figure space is by far the most important. The more people I can get down in there the better!