Buy ammo. And, do it correctly.....I have a few friends who still don't get it, ie: when I ask, "how much ammo do you have on hand?" I get a few answers of : Got plenty, plus 14 guns in the closet. Have 3 or 4 boxes of 12 ga, a couple for my kids .410, couple of boxes each for my 6 rifles, and a bunch of partial boxes for all my hand guns. I tell them that's fine if they can stay in the house and shoot out the windows, B-U-T if they need to run outside and shoot from behind the car or garage, they may find themselves in the do-do. One can only carry a couple of long guns (of different calibers) and a couple of handguns while on the run, along with their ammo. You shoot up those 3 - 20 round boxes of .30/06, 4 boxes of 7mm, 3 boxes of .45 ACP and you no longer have 3 guns....just 3 clubs.
Designate one shotgun, one rifle and one handgun as your primary "social unrest" home defense weapons and load up on the ammo for them. Having 20 guns doesn't do you any good if all you have is a few rounds for each. Kinda hard to watch out the FRONT living room window where the armed looters are moving around and dig through the BACK bedroom closet for more ammo. ("I KNOW I have at least a half box of .270 somewhere from last deer season......where the hell is it ???").
If you can't afford lots of expensive high caliber ammo, get a few bricks of .22 ammo. 300 rounds flying out that window from your .22 rifle and pistol may not drop a 250 lb man, but a wound in the arm with a .22 will slow him down, take him off the attack and put HIM on defense. Plus, with a bucket of .22 ammo, your wife and kid can easily load one gun while you shot the other.
Don't forget magazines / clips. It's great that you have 1 EXTRA mag that came with your favorite deer rifle, B-U-T a total of 2 mags with only 5 rounds each isn't going to last long until you hear "click" and stop shooting to reload them. If you can't get oversize mags, get a sack full of the "regular" ones.
AND, as noted by another FREEPER after my post; Ensure you have slings on your long guns, so you will have at least one hand free when on the move. If you don't want to "mess up the looks" of your beautiful 375 H & H Magnum with swivels and sling, at least have some precut lengths of small size rope or strapping handy to use for an 'emergency' sling. You can always tie it around the stock and forearm (or barrel) and throw it over your shoulder. It doesn't have to be 'pretty', just a temporary jerry-rig that could save your life.
If you know, you don't have enough. Only time you can have too much is when the house is on fire. ;)
/johnny
If someone asked me how much ammo I had (or anything else), I would give a vague answer as well.