I thought about ducks.

Water is an issue. I rely on storing rainwater.
This year I ran completely out of water.
Also, I would have trouble keeping a container of water from freezing in the winter.

I have no electricity or water in the garden.

I will go for a solid breed of chickens - they should be able to forage much better than ducks and they come with different personalities, too.
Perhaps I will just get Silky Chickens.