Always have activated charcoal on hand!  Best is to keep fluids going non-stop.  Food should be the least part of recovery.  White Rice (which I rarely suggest using) is very helpful when people are sick in the stomach, as is clear fruit juice (avoid too much fiber juice) low fiber. Probiotics are good to use every day, especially when you have this type of bug.  Generally using homeopathics, 30C, 4 pellets, 4 times a day for 2-3 days.

Homeopathics that are good to think about:

Chamomilla: This person will be very irritable, cranky, they might have very foul smelling greenish diarrhea and complain of gas pains

Arsenicum Album:  Good remedy for a person that has diarrhea related to food poisoning, they might feel so thirsty but will only take small amounts of water

China Officinalis:  Painless diarrhea that leads to debility and exhaustion.  A lot of gas, and gurgling in the digestive tract area.

Veratrum album:  This person is cold, feels cold to the touch, and actually breaks out in a sweat.  They are exhausted and feel as though they are going to faint.

I would  always suggest consulting a doctor, these are just merely suggestions listed above!