I didn't buy any before LO was born. Only got them later on once I expressed the odd feed. TBH I've hardly used them.
I was stubborn and also felt it better to not have them or formula in the house and to give BF'ing a real chance for a week and let my milk come in. I trusted that everything I knew about how long it could take for milk to come in, baby needing to feed a lot and so on would get my milk going. I didn't want bottles around in case I had a weak moment. Honestly, it was later on, around 6 weeks plus I found it the hardest but I still only gave a handful of expressed feeds. I'm a really stubborn cow and tbh realised deep down that BF'ing once it was established was far easier and less hassle than formula or bottles.
If you are really keen to give it a good try and are prepared for it being bloody hard work in the first few weeks possibly then go for it and don't get bottles. You can always send someone out for a couple if need be. LO won't starve in the early days as they have a supply of fat laid down and also your body produces the all important colostrum for baby till your milk supply kicks in.