Raised beds, collecting rainwater as well. - perhaps tiered beds can have a French drain at the end that catches excess water run off from the rain. It would be a larger area to collect rain water and would only be extra If the other plants were all
Make a 'Sunroom' - Rig up a 'sunroom' like this one from Abundant Permaculture and let the sun keep the water from freezing. Your chickens will also love lounging in the warm sunny area out of the wind.