I have never made a vinegar based sause, not particularly fond of that type of bbq. However, regarding shelf life; I now have sauce (Tomato based) in the fridge that has been in there about 2 months. It's still fine.
Bo Compton in Mesa, AZ, KCBS CBJ
Weber Ranch Kettle, BDS Mega, OTS, Weber Platinum
WSM w/Stacker from ProQ
LFSA RED Thermapen,
And 1 2010 Victor brand Hot Dog Cart