Do you have hens or roosters too?
If hens that are laying, I recommend layer feed. If you have roos also, then all flock, but you’ll need to supply oyster shell.
You don’t need a pan for scratch, as it’s best to only use small amounts, and if they’re outside, I’d scatter it so they can “scratch” for it.
Whether to keep water in the coop depends on you.... I always used to keep my waterers in my coop. When I moved them outside is was to prevent humidity in the coop and to keep them cleaner, as my coop is dirt floor. However, keeping water outside means getting out early every morning so they can get out to it. For me, it means no sleeping in. (I don’t anyway.)
I don’t keep food in the coop, because of the rodents it attracts. My feeders are outside in their run.
The corn, you don’t need.
The grit, while necessary, is probably something they’ll find while roaming around.
Good luck!!