Pick up some plastic storage containers for your gear and food items - keeps the varmits/bugs/spiders out, and everything dry. When we were kids and needed to bug out for a storm or tornado warning it was always pouring down rain so everyone was soaked by the time we got inside. My folks always had a good supply of dry "junk" towels down there to dry off with. I would think a porta pottie would be a nice thing to have as well. Be sure to rotate your food items and water supply every 6 months or so.

Hope you never need to use it.

Best Regards,
Pete

__________________
Don't tread on me