These not only help replenish just liquid, but they also help to replenish essential electrolytes such as sodium and potassium. Again, your
stomach may handle these better room temperature at first
and definitely again, small sips frequently at first.
Also, popsicles or icie pops are good to have on hand when you've got stomach troubles. Sometimes it's easier and more soothing just to let those kind of melt in your mouth rather than trying to actually drink something.