What are you guys doing when you need to switch to formula milk. I have a 2 month old and I ned to get back to work in 10 days. Help please!

Pump ka ng molk momshie pag madami kang supply saka mo ifreeze ... pero kung formula milk talaga gusto mo ipainum...basta ibigay mo po follow nalang da instructions indicated at the back...pag grey or hirap mag poop that means di nya hiyang ung milk kaya dapat bilhin mo muna ung maliit 400g ata ung pinaka maliit para di sayang