Compost is the best thing you can use to hold the water in. The application rate is 1 cubic yard per 1,000 square feet.
If you can water once a week, that should be plenty...oops! Tampa...does that mean sandy soil? Also I have to assume you have St Augustine grass. Deep infrequent watering is the rule to develop deep, drought resistant roots. Doing that by hand requires a lot of standing around.
Also it will help enormously if you mow your grass at the mower's highest setting. Tall grass shades the soil so you have cooler soil and less evaporation.
Does this seem helpful?
_________________ David Hall Moderator Dirt Doctor Lawns Forum
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