I found this on the Harris County Flood Control District Web site:
Family Flood Preparedness Plan
The American Red Cross and FEMA have jointly published excellent brochures entitled “Your Family Disaster Plan” and “Your Family Disaster Supplies Kit.” Every family should obtain these and follow them. They cover more than just floods and will also be useful for other potential disasters. Knowing what to do is your best protection and your responsibility. To obtain a copy of the brochures, contact the Houston Red Cross office at: 713-526-8300 or search their website for related information.
Of course, you can always just use this link instead. With an imminent hurricane on its way to Houston, this plan is especially important.