From a fuel conservation standpoint (you wouldn't really want the generator running constantly) I'd suggest filling up the bathtub with water and keep a 5-gallon bucket on hand. You can flush the toilet by pouring water into it and this is something that has come in handy in over 30 years of dealing with tropical storms and hurricanes.

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I'd recommend using a good cooler (and ice) for food that needs to be refrigerated and freeze anything else. Freezers are usually better insulated than fridges, keep the interior at a lower temperature, and the food being frozen gives you more leeway as to keeping things at a safe temperature. It can be as little as 4-6 hours with your fridge being off before the interior is warm enough for things to spoil.