We buy the stuff at Costco, two large bottles together is the way they usually sell them.
Doesn't last all that long.
Find it a great ingredient in many recipes, just often have to keep it under what I call the taste bud level (the point where one can actually figure out what gives it a bit of a zip).
Will even add a bit on top of a grilled cheese sandwich (yes, it is getting close to Welsh rarebit that way).
Have found abandoned bottles in the pantry. Never worried about them. Yes I know they find bacteria miles down in the ocean next to lava outpourings, and almost everywhere else. There are even those who suggest life on terra frima may have come from bacteria on meteors, those miocrobes can live anywhere. But I doubt there are any that have morphed to live in W sauce.
Only one question, who in the heck puts out Worcestershire sauce in gallon jugs? (Maybe restaurants have them, heck if I know).
Happy new year.