We live in tornado country, so I tell anyone that stumbles across my preps that its for tornado emergencies, doesn't actually make a lot of sense (a large tornado is going to whip my supplies across the county if it hits my house), especially if they find me cleaning my guns, but it makes most people stop asking questions and move on. I only let family and friends into my basement anyway, so I try to keep opsec as much as I can, but some items are hard to explain away.
http://seanownsthemoon.blogspot.com/