In answer to some of the suggestions offered thus far:
The water is safe from irradiation as long as it is sealed up. Canned food is not safe from irradiation because of chemical changes that are caused by the radioactive interaction with natural sugars.
The toilet is not vented because it is a porta-potty with a sealed reservoir, except for when it is being flushed. When the holding tank is full, I'll dump it in the toilet next to the garage. There is no venting there either until we can air out the house. We keep air freshener/deodorizer/disinfectant in sufficient quantities to help belay the health hazards with this system. It is far from a perfect solution but it is workable.

Keep the thoughts flowing so we may all perfect our own plans.

For anyone living near ground zero, find a deep cave, mine, or an old fallout shelter that you can get access to when it matters.
Always remember that the last thing one must do is bend over & kiss your butt goodby, while you still have the chance,,,just in case!

The best luck is what you make yourself