Avoid irrigation runoff, place sprinklers strategically and not overlapping each other. Do not cut the grass too short. Longer blades of grass reduce evaporation and root stress because the shaded soil will not dry out as quickly. Control any insects that attack the lawn or plants with environmentally friendly products. Use mulches in flower and shrub beds.
Mulches shade and cover the soil and minimize evaporation.
Contact your County Extension Agent, the Texas Department of Agriculture, or the Texas Water Development Board for any further questions. Education is the best defense we have to withstand Nature and adapt accordingly.