Chickens won’t eat/drink out of new source. Please help.

Recently got our chickens a bucket to store food in and another bucket to store water in. They were a good idea as we always have food go to waste from wild birds and the rain.

It’s been 2/3 weeks and they’re aware the food is in the bucket, if I use my fingers to scoop some food out to the edge they’ll eat it, but other than that their heads won’t go in, especially our rooster as he has a huge comb. Any alternatives?

For the water they drink it when there is seeable water, but won’t peck the yellow thing to make it pour some water in.

Please give me some suggestions, thanks!