Flamethrowers are good, but would probably only work after a period of time, during which the burning zombie has set fire to everything around it. Bullets are good, but what will you do when ammo runs low? Likewise, once the petrol runs out for the flamethrower, all you have is a rather large paperweight. After all, there won't be any arms factories or oil producers around for a while. It's a tricky one since blunt force trauma has minimal affect to the undead, so things like grenades, missiles and concussion based weaponry will have no effect, except perhaps the removal of the odd limb through shrapnel.
Water, likewise, won't do anything because they'll just walk underwater to get at you once they find you. The extreme cold helps, their bodies will freeze up, probably one of the safest places would be far far up north in the Canadian extremes...but of course you'd have to make sure you had PLENTY of provisions and fuel to keep yourself warm, fed and watered.
I do have some concerns about my castle, one of them is weathering sieges, and the other is trust. After all, just because there is a zombie apocalypse, it doesn't mean that the person you think you can trust isn't going to leave you to get eaten so he or her can keep more supplies for him or herself. Like Raptor said, gangs and marauders will become more dangerous than the zombies after time and decay sets in.
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