Milo if you drink it.
With DS they only had coffee & tea. I didn't like the idea of either of them, but there was no milo.
Camera with extra batteries.
I always had a dummy JIC.
Mittens, incase baby scratches.
Maybe one of those sleep mask things. Its not exactly dark in hospitals.
Heaps of change. For drink/snack machines & the TV if it has to be paid for.