A combination of 1 and 2. In a disaster situation you'd better have damn good employees if you think you can expect them to show up, so I'd raise prices modestly to ensure their loyalty is rewarded. 

A per customer cap with a requirement to pay in your preferred currency would be my next move--whether that's Bitcoin, bullets, food or cash. Prioritize what YOU need and make the market meet that for you. 

Operating as normal just provides the opportunity to someone else to scalp your precious resource.