I would say that during my beekeeping I have tried all feeding methods what in this forum have been mentioned. It need not much idea to put out something to eate.
My opinion is that, all trials to make bees flye out, carry water in, fly for vain searching nothing, hives figting against each othe and what childish operations, they just stress bees.
Bees fight even on waterpools.
This summer I was in a farmer's home yard. Some bees came to sniff my car. I asked that I could bring a lure box in the yard to see what is there. It was a small village which did not have bee hives.
Next morning there were two kind of bees, Carniolans and Italians and they try to fight with each other. About 20 bees and fighting. It told that there at least 2 wild colonies in the village.
Once I feeded irradiated pollen in home yard. I had 20 hives in the yard. Bees started to gather pollen but in the afternoon one hive was congured the pollen place and the flow of pollen bees went only into one hive.
What ever you feed outside, there are handfull of dead bees on site.