First you must look at your lease to see what recourse you have for Landlord default.
The casualty clause is what covers if there is an accident or damage caused not due to your actions.
Therein a time period should be alloted for when the damage must be estimated, repair work commenced, and all repairs complete. You must also list in writing your demands for repair and the itemized list of all malfunctions, and areas of concern or unhabitability (water, mold, leaking, pests, structural issues, etc.). Address this to landlord and owner according to the notice provisions in the lease. If progress has not commenced or is being delayed you must request a timeline for when it would be completed and then decide if you should litigate with the owner by moving out and breaking your lease. Consult a Texas real estate attorney to give you good advice.