I have already given birth but I have the exact same questions as you. If I am feeding my girl, I will not dry the bottles. But if I am expressing milk or storing milk, I have no idea whether I should dry the bottles or not. But the bottles are sterilized clean, and the water is clean also. I think shouldn't be a problem for it to be wet as breastmilk/formula milk contains water as well. Though I always clean away the water with a tissue first. :\Glad to know I'm not the only one haha!
I was trying to pack bottles in case I need to pump so I sterilised a couple. Then I realised they remained wet after that! Should I dry them? But if I dry them with towel or air dry in the open, they won't be sterilised anymore right?? Or can we express milk into wet bottles? Anyone knows?