8 drops each of Tea tree oil and lavender oil mixed with about 100 ml of milk for a lukewarm bath soak after birth (not too hot if you have stitches as they may prematurely dissolve.)
I used surgical knickers as I could just bin them.
A box of essentials next to my bed: phone, water bottle, labsinoh nipple cream, thermometer (room/ also my two weeks old currently caught a bug off his sister and I'm making sure he doesn't spike a fever), lip balm and hand lotion (can also use nipple cream on cracked hands as I've been washing my hands a million times a day and they're super dry).
Witch hazel on frozen maternity nappies has also been recommended to me in the past.
Arnica to help with bruising.
Snacks (breastfeeding makes me ravenous). Easy cook meals/ easy to grab meals like sandwiches... basically so eating doesn't take much prep.
Definitely bring your own drugs to hospital (paracetamol and ibuprofen). Took them three hours to give me the diclofenac I'd requested and was not given and ibuprofen or paracetamol despite a 2nd degree tear - they just don't have the time for regular doling out of pain meds after birth (this is part of the reason I've left ASAP both times!).
Pillow for sitting on in the car on the way home.
And of course, this is the stuff beside the hospital bag list stuff.