I suggest you start by watering with a good soaking and then apply water at a rate of about 1/2 inch to 1 inch per week. You can purchase centipede seed and reseed the bare areas if they are fairly large and you don't feel the existing grass will fill in very fast. Otherwise I would just provide a little moisture and give it some fertilizer (1/2 pound of nitrogen per 1000 square feet) and then water that in well.
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