Is it just 2 ducklings? I'd put about 1/2 cup in a bowl or sprinkle on the floor of the pool they'll find it but don't put it in their food bowl or they might eat too much of it. Once they are outside on the ground you won't need to offer it they'll get it off the ground, I only offer it to my flock in winter when the ground is frozen and there is snow. This is if your going to give them something other than their dumor starter crumble. just eating it they don't need grit, but we all like to give treats,.