"Black=fuel, Blue/Grey=oil, White=water", This is the "rule of thumb" of smoking from exhaust for any vehicle with a combustion engine, but there are exceptions to this. White smoke may be burning water/coolant, if only at idle, may be a sign of a seeping head gasket. If you have been running higher than stock boost, that could be the cause of the head gasket failure, if that is where the water is coming from. Remove your radiator cap, be careful of coarse, and look to see if you have bubbles at the neck of radiator, that would indicate a leaking head gasket, and check at different RPM's. You mentioned no tools on hand, so you will either have to make a decision to have it trailered home or drive it home, no mater what the issue is. So if it was me, I just might try to drive it home, but I would drive it slow and keep as much pressure off of the throttle as possible. Also have a backup plan if it does breakdown on the road. The one thing you have going for you is the small rolling hills if you run into them in the flat land around Ft. Hood, I know it well from two years stationed at Ft. Hood.