It is not possible to make baby formula (the only thing besides breast milk that babies under 4 months can eat) at home.

My baby just started eating solid food. It's really easy to make that kind of baby food at home. Baby formula, on the other hand, is designed for younger babies and is much harder.

You’d have to freeze it loosing most of convenience it provides us - having couple pouches in car or bag to use once a month or so.