C.W.
Best advice for stomach bug a doc gave me....DO NOT give them anything cold, it shocks the gut while it's "turned inside out" from the bug. DO NOT give them Sprite or 7-up, or ginger ale, no carbonation. Take pedialyte or gatorade, LET IT COME TO ROOM TEMP, NOT COLD give them 1 tablespoon of drink of this, if that stays down then in 45 mins give another tablespoon. If that stays down 45 mins later go up to 2 T., if that stays down 45 mins give another 2 T. Do this for a few hours and once it seems ok, can move to a few ounces at a time, but still keep it about 45 mins apart.
DO NOT give them anything to eat until they have kept this down for a number of hours. Him not eating isn't going to hurt anything. When his gut is ready for food, his gut will let him know. Main goal right now is to get the gut to calm down.
The key to this is to not do a cold drink and to only give a tablespoon at a time. We have done this every time they've had a bug and it works great. Remember though, sometimes it can take 24-36 hours for the bug to run it's course. Goodluck....