@lindaksirron
Yes, you can use a plastic pool with pots in it to grow daylilies. I assume you could do some vegetables that way, but you might have to research which ones would grow and not rot in that type of environment. I don't quite understand the part about adding soil around them or why you would be watering often with pots or cups sitting in a pool of water?
The idea of using the plastic pools with the pots in them I believe came about because it avoided the need for constant monitoring and frequent watering.
Also I believe I have read that the pots in the pool could even be left there in freezing weather? Sounds odd , but I believe that is correct.
So I can see in my mind a small plastic pool with daylilies growing in pots fill with dirt, but also other plastic pots filled with dirt that would be planted with seeds. They would be watered from the bottom by the low volume of water in the pool, and would not need to be watered from the top. For sure they should not need to be watered often, and probably not at all.
I am not sure just what water level is needed to do this, I would think only one or two inches. I guess that would depend on the pots and size of the cups used for the seeds.
Also I don't think this is recommended for a long period of time, merely as a temporary solution. I know I have read of daylilies being kept under these conditions for a few months.