My pediatrician has a website with the following recommendations:
For Older Children (over 1 Year Old) Offer Small Amounts of Clear Fluids For 8 Hours:
* Water or ice chips are best for vomiting in older children. (Reason: Water is directly absorbed across the stomach wall)
* EXCEPTION: also has diarrhea. ORS (oral rehydration solution, such as pedialyte): Vomiting with watery diarrhea needs ORS. If refuses ORS, use ½ strength Gatorade.
* Give small amounts: 2-3 teaspoons (10-15 ml) every 5 minutes.
* Other options: ½ strength flat lemon-lime soda, popsicles or ORS frozen pops.
* After 4 hours without vomiting, increase the amount.
* After 8 hours without vomiting, add solids:
o Limit solids to bland foods for 24 hours.
o Start with saltine crackers, white bread, cereals, rice, mashed potatoes, etc.
o Normal diet OK in 24-48 hours.
This was taken directly from my pediatrician's website, which they have referred me to in other cases. As in all cases, though, if you have a question, you should ask your child's doctor. I made the mistake of trying to offer food too soon to my son after he threw up, and he threw up again. After he threw up the second time, I went to our pediatrician's website, and discovered that I had been a little overzealous in trying to get him to eat and drink. Good luck.