Put a shallow drinking bowl inside the brooder that is deep enough for the ducklings to dip in their beaks, but not their entire heads. Ducklings like to be able to clear their nostrils as they drink, but if you give them access to deeper water they could climb in and drown.  Change the water and clean the bowl every day to make sure the ducklings don't get sick from drinking dirty water. If you fear the bowl you have is a little too deep for your ducklings to drink from safely, lining the bottom with pebbles or marbles will make it safer for them. Ducklings don't eat for the first twenty-four hours after they hatch, since they're still absorbing nutrients from the yolk inside the egg they hatched from. After that, they graduate to starter crumbs, tiny pellets of duck food available at feed supply stores. Buy a plastic feeder, fill it up, and place it in the brooder. If the ducklings seem hesitant to eat, try adding a little water to their food to make it easier for them to swallow. You can also add a very small amount of sugar to their water for the first couple of days to help them get off to a good start and give them energy. Very weak ducklings may need a little extra yolk nutrition before they're ready for starter crumbs. Feed them a bit of mashed duck egg yolk until they become more interested in the starter crumbs. Make sure the ducklings have access to food 24/7. They need to be able to eat whenever they're hungry since they grow so quickly at this stage of life. They also need water to help them swallow their food, so keep the water bowl full at all times. After about ten days, ducklings are ready for grower's pellets, which are the same as the starter crumbs, only bigger. When the ducklings become adults, after about 16 weeks, they're ready for adult duck food. Many foods humans eat, like bread, don't provide them with the nutrition that ducks need, and some can even make them sick.  Even if the ducks are interested in food such as bread, it is not good for them. Ducks can have very thinly cut...

TL;DR in Vietnamese:
Cung cấp đầy đủ nguồn nước cho đàn vịt con. Bắt đầu tập cho vịt ăn bằng những mẩu thức ăn nhỏ. Bổ sung lòng đỏ trứng cho vịt con còn yếu. Tạo lối đi cố định đến nguồn thức ăn cho vịt con. Thay đổi thức ăn cho vịt trưởng thành. Tránh để vịt ăn thức ăn không dành riêng cho vịt.