Alternate idea for the future: I prefer to put colored marbles or pebbles in the water, and not bother dipping beaks. They tend to peck at the colorful things, get their beak wet, and figure out how to drink. Once a few have it figured out, the rest can also copy the first ones.
I don't leave the marbles in for very many days, because it is such a nuisance to collect them each time the water needs to be cleaned or refilled. But I think that is less bother (for me) that trying to dip beaks.
If they are going to eat anything except chick starter, they need grit in their gizzards to grind it up. If they are living in a brooder with no real dirt available, it is generally a good idea to provide some grit before you start giving them other foods.
In this case, if you are giving them a clump that has dirt and grass, they can probably get enough grit from that. Chicks that live outdoors and scratch in the dirt will usually get enough grit as well.
Worms and grubs should not be a problem.