Can you feed baby squirrels evaporated milk?
Similarly, you may ask, what kind of milk do you feed baby squirrels?
The best formula to use is Esbilac or Milk Matrix Zoologic 33/40, or Fox Valley 32/40. Esbilac is the only formula that can be purchased at most pet shops or here at Chris's Squirrels and More, BUT, we prefer you purchase the Esbilac immediately at a local pet store.
In this manner, can you feed baby squirrels cow milk?
If you cannot afford a commercial infant formula, whole cow's milk can be used with reasonable success, especially if the orphan is already well furred. You can now teach the squirrel to drink milk out of a bottlecap by dipping the animal's face into the dish of milk.
Great idea with the breast milk, but squirrels are just not humans. It is strange how each species has such differant requirements, but they just do. If the baby was in big trouble, they your milk certainly provided fluid and nourishment, but for the long term, it will not work out.