I live in Northwestern Oregon. A century ago people used to plant Italian plums for drying and selling. Walnuts were a common commercial crop. Both of these trees can be seen growing along the road sites and producing well even in the driest years. Cherries have naturalized here, those some of them look tend to lookstressed after a long summer. Apples and pears can be seen growing wild everywhere, and produce well, with no signs of drought stress. On our farm we have many Chestnut trees planted (as tiny seedlings, with the taproot intact). They are now growing without any supplemental irrigation, After the initial establishment phase(2-3 years). Mulberries, are also going without irrigation after four years. But they look pretty rough at the end of the summer. Olives are super drought tolerant. Figs are set after the establishment phase. Peaches, similarly, though the fruit can be small and sometimes bitter if unirrigated in the early years. Hazelnuts are native here. I have a grove of pawpaws that are flourishing without irrigation. They are very well mulched, in an area with rich deep soil. wine grapes are super drought tolerant, though table grapes seem less so.