Wet it down into an oatmeal consistency (or do fermented feed) - they will all like it that way and it will help with them not spilling the dry all over. You can just use a glass casserole bowl or something like that. Also, Pekins eat a LOT - way more than chickens, so they will go through food quite quickly. Once she's old enough to eat lots of other things, you can let her free-range on bugs, grass, etc. or give them all kinds of greens with their regular food - like kale, romaine, frozen/thawed peas, etc.
Thanks I have noticed that the duck eats a lot more. I was gonna build a gravity feeder this weekend but I guess that won't work with wet food.