I'm out of MRK...I know I'm an idiot but they got up this morning and ate waaay more than they usually do. My husbnad is at work at the hospital and I am at home with 3 sick kids all running a fever and can't get to walmart till later. I have a case of Similac milk-free Soy based formula for human babies...if they wake up before I can get to the store can i feed them that?