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I seem to have some kind of anti-norovirus superpower or something. I've never caught it, even when everyone else in the house all had it at once. Racing back and forth between multiple rooms at the ER (when they all stopped keeping water down at the same time) was no fun.
That said, I've also had to learn about these things.
1) Bleach the hell out of everything. Get bleach wipes if you can (they don't really have bleach, but what they use is close enough for our purposes) and use them on surfaces. Then dimpractical.Bleach clothing and bedding if you can; this goes quadruple for sheets and underwear. Flush bleach down the toilets. Get obsessive about this. Bleach is important: norovirus has a lipid envelope, so water and alcohol will not kill it. Fire will, but that may be impractical.
2) If you can't keep water down, you have three days to live. Go to the ER. They'll give you an IV drip of saline, which will bypass your digestive system completely. An urgent care center may also be able to do this.
3) Bananas, Rice, Applesauce, and Toast. This is called the BRAT diet. You will learn to loathe it, but this will be the first stuff you're likely to be able to keep down again. Do NOT push yourself.
4) Get bed rest and stay hydrated. Water is fine. The main advantage to Gatorade and its ilk are that they taste like something that is not part of the BRAT diet, and that's not actually somethung to sneeze at: morale is important. But even if you can't get your hands on a drunk that's got what plants crave, you will be fine. If you can treat yourself to Gatorade, get one with a relatively light color; these tend to be a bit easier on the stomach, and your stomach needs every edge it can get.