1. 2x6 walls, semi anchor a bookcase/cabinet to the wall covering it. Mirrors work too.
2. Put items in old plastic 5 gal paint buckets, put them in a corner, throw a couple tarps and old roller covers on/beside them.
3. Remove floor boards, place items between joist, replace boards and cover with carpet.
4. Install fake duct work in basement.
5. Plastic 55 gal drums with sections cut out of the sides with weather stripping, hinges and hasp installed, bury just below surface, this way items can be removed easily, make sure you only store items that aren't subject to freezing depending on the area you live.
6. If you have a basement, cut out a section of the floor, dig out dirt, replace with waterproof container of some sort, place steel shelving/frig, washer etc. over opening, load shelves with light items making it easy to move.


If you don't tell people you have stored stuff most likely you won't have to worry.

You could always make sure you have some items in excess,like a dummy supply, lets say items you wouldn't really need, to offer as a token contribution, diverting attention away from your real preps.

False walls in closets and under stairs, make sure to add trim and moldings to add to the effect. Make sure not to make the area behind to deep that it draws attention.

Just a few random thoughts.