Your second post greatly clarifies the parameters for the level of effort you want, and the results you want for your pond.

If you go the 'bucket' stocking method (catching fish elsewhere and bringing them to your pond), a general rule is that river or stream fish don't do as well in non-running water bodies (and vice versa although most don't take fish from a pond and put them in a river). So, your best case would be to catch fish from another pond, or lake.

With bucket stocking, there is always a risk of transporting other organisms into your pond that tagged along with the fish. There are some ways to mitigate that.

Also, make sure that it's legal, as some states have specific rules for the same (for me, I would just be careful, and not obvious about it).

Regarding feed, you don't have to have a automatic feeder to get the benefits/enjoyment out of it. If just walking to the pond is enjoyable now, it will be even better if you throw a cup of feed out and observe the action.

All good times!!

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."