Quote: multiple 5 gallon buckets, pour off the extra liquid into a new bucket then feed most of the drained food and add the water back along with any new grains or feed. You can even get a chain going so you know which buckets are older and which are newer if they are not all started on the dame day. Or different buckets could be different feed, starter, grower, meat bird...
As for space if you flock multiple feeders spaced out seems to work better than 1 long feeder for me. A rooster can block off a good 10 inch area of one trough but he had trouble guarding all 5 little troughs that are spaced out. My ducks will maintain a good foot of trough space between the two of them, so now they get their own feeding area. But we make troughs from pallet wood so it is cheap but not long lasting.