First advice, deep breath.
Second advice, don't be afraid of your neighbors.
Third advice, if your "surprises" are improvized explosives/incendiaries/toxins and/or booby traps of ANY KIND, reread the forum rules. I'm going to say it before the Mods do.
As far as fortifications go, remember that anything that makes it hard to get in makes it hard to get OUT. And people who want in usually have time on their hands; people who want to get out usually don't. Window bars resemble BBQ racks for a reason. Talk to your insurance company, they will provide you serious information about making your home harder to rob and do it for free. But you are a lot more likely to have to get out RIGHT NOW becuase of a fire than you are to have to keep zombies outside.
Also, 1800 gallons of water... Unless you are in desert or Georgia, what can you reasonably see a need of that much water for, unless it is a swimming pool? Two gallons per day per person, plus one per day for doing dishes. Anything over 30 days is either something that by definition you can't sanely plan for, or a situation were relocation is strongly advisable if for no other reason than to maintain your income.
There is a fine line between paranoia and preparedness. I'm normally less blunt with new folks, but based on your first post, I think you're straddling that line or just over it.
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-IronRaven
When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.