If you are planning to breastfeed, I really wouldn't!
As someone else explained above, a newborn has enough nutrients already stored to last three days without dehydrating or feeling hungry - and as someone else also said the stomach is the size of a marble - if you can't get your latch right straight away then you can express that tiny amount by hand and give in a syringe or squirt directly into the mouth.
Having the formula with you, you are more likely to give up and then fall into the top-up trap of offering bottles which greatly impacts breastfeeding.
The best thing you can do is forget completely about the formula, have a positive attitude that you can breastfeed, and persevere.
If there is really no medical reason why you can't breastfeed - and the percentage of women who have a valid medical reason is really very low - then there's no reason to think you can't.
I had a section with my first, and had no support on hand or any idea what I was doing. The midwives occasionally positioned baby for me, and it was excruciating, feeding wasn't established by the time we left the hospital three days later, it can take up to six weeks...but by that point it felt like I'd been doing it forever, and it was pleasurable!
23mo later and i'm still breastfeeding!
It's definitely about attitude though - there's not a chance in hell that I'd ever give my baby formula.
Its not an issue for some people but that's what got me through the tough bits.
It depends how much you want it.
Good luck (=