It can't hurt to have one of the little ready made bottles there if you're unsure.
I was dead set on breastfeeding from when I found out I was pregnant. I ended up 2 weeks late, was induced, 2 day labour, forceps delivery...she found the boob right away, but I obviously didn't have any milk yet, and colostrum didn't seem to be enough for her (is it possible that late babies may be hungrier? that's my theory anyway) so I asked for a bottle of formula the first night while still in the hospital (she was born at midnight, and I asked for it at about 2 am the next day, so 26 hours after she was born) she had a massive one ounce out of it and then settled nicely to sleep. that was the only bit of formula she ever had, and I breastfed her until 15 months. I seriously think that one ounce saved me that night, I was so tired, I had been feeding constantly since she was born, no sleep in days...giving her that ounce of formula allowed me to have a bit of sleep, recover a little, and then go at breastfeeding full force when she woke up again. I was told off by one of the midwives, she was talking some rubbish about how I've now messed up my daughters intestines forever and how my milk won't come in and she'll never breastfeed. Another midwive took me aside and said "I'm not meant to tell you this, we're meant to promote breastfeeding only, but I think you've done the right thing there, you needed a rest."
anyway, long story short: a bottle of formula won't hurt and it may just save our sanity a little, especially if you end up with a long labour/hard delivery (fingers crossed you don't of course!!) and it won't mean your milk won't come in or anything like that.
do keep in mind that it's normal to feed constantly the first few days/weeks, and that this doesn't mean you don't have enough milk. If you struggle in any way at all, get help as soon as possible. Most women can breastfeed, but some need extra support. no shame in that at all.
if you haven't used the bottle after the first 10 days and your baby is doing well and gaining weight, throw it out, you won't need it. if he/she isn't gaining well, that still doesn't mean you need formula. get help, have your latch checked, and just keep at it. it's hard, but so worth it.