Many people there's more predators than night predators, since 80% of them can be at anytime.
Daytime strict predators are hawks, but you can see things like raccoons , coyotes, foxes, possums, dogs, bobcats, owls etc at anytime.
Thanks.
Do you have roosters?
I'd get some permethrine based powder or spray to treat the coop and your birds.
It also could be grooming from boredom or tight spaces.
Clean out your coop entirely, burn the litter and bedding. Treat the coop and your birds with permethrine based spray or powder, every nook and cranny.
6 days later, treat the birds again and you should be fine.
Your chicken looks fine.
Unless you want to use dog bowls, chickens waterers are going to be the cheapest way to water.
What feeder and feed do you have??