Watering your foundation can make a small impact on the soil's stability during a drought, but its effects are still debated. You should only water a foundation if there are no restrictions on the water in your area at the time, if you are trying to maintain consistent moisture in minimally affected soil, or if you're watering the plants that surround your home. Proper landscaping and maintaining well-draining soil are your best bets against foundation issues from a drought.