Handle water outside before it reaches the foundation: extend downspouts at least six feet from the house, correct grading so soil slopes away, cover and drain window wells, and keep the lot draining away from the building. Inside, maintain a working sump pump with battery backup and a high-water alarm, and install a backwater valve if the home has ever backed up from the sewer main.
Shut off the main water supply if nobody will be in the house, or install an automatic shutoff valve with leak sensors if you travel often. Close washing machine and dishwasher supply valves, set the thermostat no lower than 55 degrees in winter, and arrange for someone to physically check the property every few days.
Keep the thermostat at 55 degrees Fahrenheit or higher, shut off the main water supply and drain the system, open cabinet doors on exterior walls, insulate pipes in garages and crawl spaces, and set up a smart thermostat or temperature sensor that alerts your phone if the house gets cold. For long winter absences, have the plumbing fully winterized.