Can I facepalm on the thread? Is that against the rules? Would that be considered a rude thing to do?
Don't facepalm. Nothing is against the rules, we are all friends and trying to be helpful here. You are not being rude. Sorry this is so late, but ever since you posted this I have felt I needed to reach out to you.
I am so glad you are in the learning process about FF. You used some items most of us would agree are not necessary and questionable. I personally started on FF with baby chicks and only used chick starter and water. No additives, no probiotics, no ACV. Simple stupid, feed and water. My girls are 6 months now and I still feed the same FF out of the same original bucket, just feed and water, but now it is layer ration vs. chick starter.
Through your process of thinking you had ruined the batch and ready to throw it out and start over, you attempted to correct what was going wrong by adding the oatmeal. What you eventually ended up with was a nice fermented product so you learned by doing and got an end result. Was that end result suitable to feed chickens? Maybe not, but you are on the right track for understanding how FF works and realizing you don't need this 2" of water over the top and how to get the great fermented goodness to absorb into a grain and become one of itself.
If you didn't feed this to your flock you can put it in your compost bin. The one thing about adding more to a batch than commercial feed is you now have no control over the nutritional content. If it were me and I had that oatmeal batch you have, I would save it and dose it out as a replacement for kitchen scraps. It is fermented, it is full of good probiotics and nutrition. I just wouldn't use it as a daily ration of feed.
Please keep coming back and asking questions. Start a new batch of FF, fill us in on the details and let us help you. FF has so many benefits, including the driest of poos and a completely stink-free coop.