Real Estate Law
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Any time a rental apartment or house becomes uninhabitable for any reason, the tenant is entitled to a rent abatement for the number of days he can't live there. Just make sure you get proof of the water supply problem so that if the landlord sues you for the rent, you can prove it was impossible for you to live there. It would be best if you notified the landlord in writing of the problem and your intent to move.
Thanks for clearing that up. In that case, the answer is that you do NOT have to provide substitute housing and you can simply pro rate the rent.