Your best option is to notify the landlord IN WRITING. Certified letter, RRR. Demand a fix ASAP and tell LL you will consider the contract in breach if he does not repair the leaky room. If he fails to act, you may want to contact a TX landlord tenant attorney to ensure you have adequate grounds to take further action.
READ THIS BEFORE CALLING OR EMAILING ME: I am licensed to practice before the state and federal courts in Virginia. We have not established an attorney-client relationship unless we have a signed representation agreement and you have paid me. I do five my 100% effort to get you on the right track with your issue. Sometimes that means legal educational information, sometimes that means counseling and non-legal guidance. You should speak with an attorney to whom you have provided all the facts, before you take steps that may impact your legal rights. I am not obligated to answer subsequent emails or phone calls unless you have hired me. I wish you the best of luck with your situation.