One for Whirlybird. It's thinking about things like this that makes for better flight preparation, I think. Perhaps many may not be aware that the prime cause of pilot incapacitation is by far tummy trouble and associated 'gastric works' and this can be incredibly debilitating. Full marks for those planning for such eventualities. One can only say that there are two kinds of pilots, ones that have had the indignity of having to go in flight, and simply those who are going to suffer the same.
I'm lucky I guess, since I am now of that age at which I can make the decision never to fly an aircraft that doesn't have a toilet on board!