In my opinion, the OP's plan to shut off the water for a 2-3 month absence is fine. It would be helpful if someone could check on the house once or twice during that period, if possible. I do agree that the AC should be left on. I think this would be consistent with the way the builder takes care of their new houses that are vacant for months before they are sold. I don't believe that they have someone who runs the water and appliances every week in those new houses.
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