Reduce hazards--throw rugs, cords, install night lights, gates at stairwells.
Provide a place to wander safely. Install alarms & locks--pressure-sensitive mats, warning bells on doors, child proof covers on doorknobs or second lock out of line of sight. Disguise exits--curtains, stop sign, mirror, or large poster. Have them wear a gps device or emergency bracelet. Remove triggers-hat, coat, keys.