If by 'sickness bug', you mean you've got the nasty diarrhea & vomiting monster that is norovirus.. keep an eye on your BG in case you start going hypo and ride it out. Usually lasts a couple of days and is an unpleasent way to achieve weight loss. I guess the main thing is to stay hydrated and try to eat something. Good'ol chicken soup often works, and I've found scrambled eggs worked for me. But figure on something that's fast absorbing by the stomach, because it may not stay in your digestive system for long.
Oh.. and most hand sanitisers won't save people on account of them usually being antibacterial, and it's norovirus. Good'ol bleach or chlorine-based disinfectants work a lot better for clean-up & containment duties.