| Having just got my power (and internet!) back after Hurricane Charley, I'm starting to think about some things I may do right before another hurricane comes through, one of which is store more gas for use in my BMW (I did at least fill up before the storm). I have plenty of stored gas for my generator, but I'm not as concerned about using stored gas on my cheap generator than in my BMW.
Can anyone tell me specifically what I should do to store gas properly for use in my BMW to ensure that I don't damage anything. I know even properly stored gas goes bad, and there is always a problem with exposure to water vapor regardless of the container you use. I know you can add fuel stabilizers, but I'm not sure if this will damage anything in the engine. What kind of container should I use? How long can I keep the gas before it goes bad without stabilizers? I'm also curious as to how long gas stations are able to store their gas in their underground tanks and why? Are they airtight or do they add gas stabilizers?
In short, I'm just not as knowledgeable as I should be on this topic and would like any insight. It's not like having my old F-150 truck where I wouldn't care about driving off a little "bad gas", but this is an expensive BMW that I really don't feel like screwing myself in the rear on by doing something stupid, if you know what I mean. | 
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