Tell him that there are people on here who recorded feed consumption and costs comparisons of when they feed dry to when they feed FF and found that they feed almost half what they feed dry when using the FF. Almost half the cost of their normal feeding....half. That's a lot of money when you think about it adding up. So you pay half the cost you usually do for your eggs, your chickens live longer, healthier and more productive(yes, even more eggs than normally produced) lives, the eggs taste better~by far!, the coop stinks less and needs less cleaning.
If that ain't worth pouring some water on the feed and waiting a bit, I don't know what is!
If he doesn't want to make you a trough, just get his tools and head outside..and do it in front of him. Nothing will make a man move faster than a woman headed to the outdoors with his tools.
If it doesn't, build your own trough. There is no man around here building mine...I do all the building of things that need doing here and you can too. It takes absolutely no skill to work a drill and a sawsall. I can attest to that!
And, yes, you can dish out several day's worth of feed and leave it for them...it will actually be safer than when you used dry, as the mice don't seem as attracted to the coop now that dry feeds aren't being scattered all over the floor and crevices and I've not seen them be able to get a speck of this FF as the chickens eat it so quickly and thoroughly.