SWALES: Build ditches/swales/depressions every row to collect water and give it time to soak in.
WOODCHIP: This will help house good soil life, water and minerals, cut down on evaporation and run off, help aerate the soil via soil life.
BIOCHAR: If you are worried about the hay/woodhip catching on fire, this can be incorporated into the soil, and it will hold more water, aerate, house soil life, hold mineral
ROCKDUST: This will add mineral that you soil is missing vs just the usual N_P_K fertilizer, the water in your soil will now contain extra dissolved mineral so less water needed
MICROBES: Fungi have much more water-efficient "roots" and they can mine the minerals for the trees and trade it for sugar, All those microbes, pooping/peeing/decaying is manure.
LEGUMES: These guys will fix most of the nitrogen that you need and when they die/decay/chopped/eaten-poop. they will release the nitrogen that they have.