You guys have absolutely no idea how relieved I am right now. I am NOT the only person with this scenario passing periodically through his head. I usually call this an excercise in creative thinking, so I'll let y'all in on what I've thought.
First step - fight my way to the nearest military base that is of a smallish size, there are several in the general vicinity of where I live. Here I would be able to procure many needed supplies/equipment. Most bases have an ASP (ammunition storage point) that are just chock full of 5.56, 7.62 & 9mm ammo as well as neat stuff like grenades & claymores.
Weapons - I currently have a 9mm Sig, a .22 Marlin and a .270 Savage and a K-Bar (more as a tool than a weapon). Both the rifles have scopes. With these weapons I feel I have a good start. Both the rifles are in popular calibers and are good out to pretty much any range I'd be shooting at. The 9mm is also popular and accurate enough at close ranges.
To supplement my weapon selection I would procure a couple M-16s and a couple military issue Baretta 9mm. Every arms room/armory on every military base would have these, as well as extra magazines.
Grenades would be a secondary objective, but I would not endanger myself searching for them.
Transportation - I have a 4x4 pickup, stock ride height with a 300 ci 6 cyl engine. This needs replaced immediately. My vehicle of choice would be a HEMTT.
They are large 8 wheeled vehicles with a large cargo bed and have an onboard crane. The cargo area is about head/shoulder high on an average person. They are also nearly as prevalant as the 2 1/2 ton or 5 ton cargo vehicles. The cargo area is large enough to accomadate a reasonably constructed shelter, in fact I have seen commo shelters on the backs of HEMTTs before. Some creative cutting of the roof would provide access between the cab and shelter areas negating the need for contact with the ground. It is diesel, however it can run on nearly anything except water. I am unsure where the controls for the crane are located, so they may have to be moved/modified to operate the crane from the safety of the cab/shelter.
Food & supplies - In nearly every military base there are supply warehouses containing everything from BDUs, cold weather gear, boots, rucksacks, LBE, etc. to MREs & C-rats. There are also many D-facs (dining facilites for the military challenged) which contain provisions.
Once I'm well equipped the second step would be to find a suitable place to occupy. In my area there are several potential places. One is an ATF building which is surrounded by chainlink "privacy" fence on about 5 acres. The other is the VA hospital which is situated on 175 acres and has more buildings than you can shake a stick at, it is surrounded by chainlink fence with the exception of the front entrance. This would be an ambitious endeavor, and would require a large group of people to secure. It is however agacent to the ATF compound. The third idea is a book printing/binding facility. The grounds are not fenced in, but it has several loading docks which would provide above ground access to vehicles. This too would probably require a group of people to secure.
For now I'll cut this short, but believe me, I've thought alot about this, mostly at work. Maybe if this thread continues on I'll add more later on.