Same here the hospital gave us a list, but they don't provide much.
As someone else said they were taking milo, neither of us drink tea or coffe, so i think I will do something similar.
To save room in my bags I'm packing a plastic bag of extras for the car, like extra pack of pads etc so that if I need it i just have to tell dh after the birth to go and get it out of the car. That way we won't have too much stuff in the room with us.
Toiletries are hard though, some people have suggested to me sample size shampoo and conditioner, Yet I haven't seen any around, so I'm going to get some of those little bottles and fill them up.

Oh I almost forgot, I'm packing some zip lock bags to put dirty stuff and toiletries in so everything doesn't get wet.