Preparing for if Breast Feeding doesn’t work

Is it possible to prepare for formula incase breast feeding doesn’t work out?? Formula is so expensive I would love to buy in pieces to have on hand just incase. I’m just not sure which type to buy if I did do that. I prefer Enfamil. It’s what I was on as a baby, my 1st born also used it.

My 1st started out with breast feeding but had to switch to formula for medical reasons. And I’m not eligible for any assistance this time around (which was a huge blessing to me with my 1st).