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Sifted dirt, sure. It needs to be fine and well... dusty.
But, you can start a small fire pit almost anywhere to burn woody yard refuse, sticks, dead vines... what have you. It only has to hold a few cubic feet of volume to make an adequate and measured blaze. Make it longer than deeper, so a draft will be gotten in. DIg it trenchwise and do the burning on a screen or grid over the top, so the ashes fall to the bottom. So you see, you don't need a fire place, per se, but the ashes themselves are beneficial to the birds and worth the getting in.
Store them in a covered container so rain wont render them mucky and useless.
BTW, they are also very good in the garden, especially tined in around tomatoes or dug deep between crops. Give them a try - and they are virtually free. Chickens should always be managed with an eye to minimum cost.
DE will cost you, of course, so that kinda nulls the whole "minimum cost" thing...