Hi HB - Oh I wish I was back where you are now....congrats and here goes with my advice.
Yes, I would get a couple of bottles because:
a) our DD nearly got dehydrated as it took a while for my milk to come through so we gave her some boiled water
b) you may need to give formula if there's a problem with BF...and
c) getting a baby used to a teat is no bad thing - you can express your milk into it & your P can do the night feeds!! . Not only that, your babysitter can feed your baby when you & your P have a night out. Lots of people I know ran into problems because there was no way their babies were going to take milk from anything other than the breast!!
You need to get a hot water bottle - not for you but for keeping the cot warm when you take your baby out for its feed! Wrap your swaddling blankets around the bottle as well. Once you have finished feeding, they have a warm snuggly cot waiting for them and guaranteed they will go straight back to sleep. This is the bestest advice I was ever ever given and I swear this enabled me to get DD into a 3-4 hrs feeding regime without the aid of Gina Ford.
I would get long sleeved babygros - layers are best though you cant go wrong with body suits either (great for car journeys!). For the first 6 weeks I swaddled DD - then it was into a babygro (fab invention!!).
Make sure you have 2 changing bags - one for the house and one for the car. I was always forgetting spare clothes for accidents, and there would always be something missing from the bag/I would use up all the nappies in it.
Metanium cream for nappy rash-clears it in a day!
Colic medicine, always best to have some in the house....it was infacol in my day!
Make sure that:
a) you know how to fit your car seat before you go into hospital!
b) you have your central heating serviced asap - you do not want to be without the essentials when you come out of hospital
c) you should get the mumsnet book on Pregnancy & Babies....unfortunately for me they came out after my DD was born but I have since bought them for friends and they are absolutely fantastic - the best thing you can buy (next to the hot water bottle!)
d) Black out curtains for the baby's room.
Good Luck!