Yeah, I've been there. Just make sure you don't leave it out too long or bacteria will grow. I like Pacific Foods (I think that's what they're called) chicken and rice soup. Doesn't have a bunch of unnecessary additives and mysterious "flavor" ingredients.
When I feel myself first getting sick, I will often make myself a big pot of chicken noodle soup or pho that I can just heat up to get me through it. Have to do so before you're really sick, though, of course.
Chicken pho is another good one if you have that available near you.
Oh, saltines are good as well.