Why go to the hospital when you can take pictures of yourself and post them to Facebook.
Water Purifier: Since all your neighbors' stank will be floating in the water, you'll want to use a purification system before you take a swig. Get a small and compact one, as well as some empty jugs to put the water in.
Red First Aid Kit: Sure, it's obvious to take a first aid kit, but why red? Because if you are stranded, you will hopefully have rescuers searching for you from the sky. Do we have to spell it out for you?