Pigeon have a range of bottles which are supposed to mimic the shape of the breast, we used them when trying to coax DD2 back to the breast. I used to just express into the bottle that came with the pump & then tip it into the Pigeon bottle for feeding.

You could use anything really, as MadB said they do tend to match up to pumps so that is one way to go, and Harriet is right oo - all babies are different in their preferences. The only thing I would caution against is trying a bottle too early. Let the breastfeeding get well established first.t