Its fun to think of these situations where we can use all our toys and play survival but (and I've said this before) if we are in a situation where we are selecting people outside our immediate families to protect and shelter,
that my friends is completely different scenario and a extremely nasty high danger situation we would be in!!!!!
Remember, the more food, guns, ammo, batteries etc you have, the more of a target you will be. Once in a survival mode, there will be a complete breakdown of civil order. People will become savages.
Its really not a scenario you can prepare for on Long Island.
As far as the topic question, If you get to the point where you are turning people away!! your done, the words out already on your household that you have food, water guns etc. The word will spread.
You cannot defend against NUMBERS!!! Eventually, they will win.
Your only chance in this situation is the appearance you have nothing, but that will very hard to do.
So, here's my summary and opinion for LI survival.
-Prepare for a two week storm aftermath for your family, anything more serious than that cannot be realistically prepared for.