That's not how it works with milk production. You make colostrum, in tiny amounts for a few days, but that's all your baby needs. Your baby's stomach is the size of a small marble, and they will feed little, but often. That little but often stimulation helps your milk come in.
Babies can often seem hungry because they have a reflex to keep sucking, so it can seem like they're always hungry.
They have to keep sucking to bring your milk in.
It doesn't hurt to be prepared and take some bottles with you, but it's a self fulfilling prophecy if you misinterpret sucking and repeated needs to feed as not getting enough, so you supplement, then you don't get that stimulation so your body doesn't produce, and then it becomes much harder to stimulate lactation further on. - if breastfeeding is the method of feeding you choose.
Babies also lose a percentage of their birth weight, which is normal but a lot of people panic when they see this, but it's important to listen to your midwife so they can tell you if this dips into failure to thrive territory, and they can help you with a double or triple feeding method, if you still want to breastfeed but your baby requires supplementation.