These bladders are preferred over plastic bladders (from Platypus or Camblebak) because they don’t get old and rigid. The MSR bags are also more puncture resistant and durable. These bags can be hung from a tree limb and provide easy access for hand washing, rinsing pots, and can even be used as a shower. You may also consider a hydration tube with a bit valve for added convenience.
Sports bra. Disasters don't happen at convenient times and If I'm evacuating it's probably the middle of the night and I'm probably not wearing one. At least this will remain comfortable. A longer one can double as a tank top during hot weather.