Here is how I replenished myself after I was able to keep foods down and the vomiting and other gastric distresses subsided.
Clear Veggie Broth
I simmered all the veggies I had at the time, cabbage, carrots, celery, onions and lots of garlic until soft. Then I sipped the broth with a dash of nutritional yeast from a cup until I could move on to some soft solids.
Once I could keep down solids, I added the vegetables back in along with some fresh spinach and mushroom to replenish my vitamins and minerals.
Then I moved on to adding some light juices and whole bananas back into my diet. I needed to nourish without overloading my system with too much fiber...my system was already clean enough! (Know what I mean?)
I juiced some carrots, apples and later added some juiced blueberries to the mix to add antioxidants.
I found these options an easy way to replenish my system and heal after such a tough bought of stomach flu.
I hope this helps.
FYI I went to the doctor after 48 hours of not being able to eat or drink much. Don't be a martyr. Doctors can help!