Plenty of good advice here. If you do nothing else, shut off the water. The lawn sprinklers are on a separate system, so it won't be affected.
Something else I did when I was still between places, based on some research, was to put a thin layer of mineral oil in the toilets and traps. It sits on top of the water, and reduces evaporation, so the traps don't start to get dry and allow sewer gas to come into the home. Don't use petroleum based oils for obvious reasons, and vegetable oils can go rancid.
Once back, just run water down the traps and flush the toilets, clean the toilet bowl, and you are back in business.
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