As most of you know, the expansive clay soils in the San Antonio area behave much like a sponge.  When the soil dries - it shrinks. When it is wet - it expands.  I am hearing stories from all over town about serious foundation problems occurring in a matter of a few months.  The culprit is our long term drought.  To minimize movement of your home's foundation, you should keep the soil moist and expanded.  You should water from the edge of the foundation to about 5' outwards to maintain moist soil.  This could save you a lot of money. Since we are on water restrictions, you will want to make watering around your home a top priority.  If you see signs of drywall cracking, floor covering material with cracks, or sticking doors you will need to water immediately.  When the moisture absorption and dissipation is uniform, the structure may resume a stable position.  Hope this helps!