hehehe... one day at work (I work at a pet food store) somebody dropped off baby squirrels at our store so my manager and I took them in. We were trying to call around and see if anybody knew what to do with the darn things as far as food went and nobody could tell us.
FINALLY we contacted an exotics vet who knew about squirrels because she did some weird jobs out in the great outdoors for the arboretum, and she gave us some rough ideas as to what kind of nutrients and in what quantities the little guys needed. We then discovered that it was pretty darn close to what's in most dog foods!
My manager then went on to keep one of the squirrel babies for a little over a year, and it was the healthiest squirrel that ever lived, off of nothing more than dog food and veggies/fruit. He then proceeded to run away and we never saw him again
I've had some encounters with baby squirrels since then (my cat is a crazy hunter, so we had some orphaned squirrels on our hands after one of her raids) and it's been what I've always done. Works wonders.