It looks like you have....7 that are about 2-3 weeks old?
You could move up to the gallon version of the waterer that you have- that will buy you a little time. Since they are in the brooder still, that might be the best option.
Also, if it is warm where you are, and you have some way to corral them- it might not be a bad idea to give them some supervised pool time daily. That will allow them to swim, and have access to water deep enough to clean their nares.
A “pool” just deep enough that they can barely touch the bottom, even if you have to put a brick or stone in a corner to make it easier for them to get out when they want to.
I find the low (under the bed style) totes, or an open kitty litter box to be good pools at this stage. And I use whatever I have one hand as a “fence” on my deck (usually one of those folding “dog pens”) so they can be out of the pool when they want but are still corralled.
IMO
It is likely they are staying at the water because it isn’t deep enough for them to dunk their beaks and clear their nares.
The gallon version of that “chicken waterer” does have a little deeper basin, but it is still questionable as the only water source IMO.
I like the idea from
@cheezenkwackers ... but they might be too small still to go in from the top of a short container like that?
I have a 5 gallon round bucket that I cut 2” wide x 4” tall ovals around the sides for my adults’ supplemental water.
The bottom of the ovals are about 4.5” from the bottom. I fill it twice a day (I give them water overnight and just move the bucket in/ out of their coop). The adults also have constant access to their pool, but the bucket is a good back up in case the pool gets too hot in the summertime when I’m away from home and can’t refresh it.
Mine isn’t quite like this, but this is where I got the idea.
You could also probably find a baby size plastic container of some sort to use for your youngsters if you aren’t in a position to offer pool time -
https://www.permaculturenews.org/2013/05/20/poo-free-self-filling-duck-waterer/