Insulate your external pipes to prevent water from freezing and becoming solid in the winter
To keep the water flowing, always run a tiny amount of water through your faucets.
Open the cabinet doors under sinks so that warm air may warm your pipes
Door entrances to the basement, attic, etc. should be sealed
Insulate any outside or inside water storage tanks that are exposed to the elements
To maintain the effectiveness of your outside hoses, take them off and put them away