I don’t have salad at home too often, but I also use the Italian salad dressing to marinade chicken breasts.
I generally try to either use the bottle up within 2 weeks after opening or toss it. Too soon or am I taking risks with even letting an open bottle go 2 weeks?
Oh man, two weeks? I’ve got bottles of salad dressing a couple of months old. We just don’t eat that much salad and we have a couple of varieties. It’s oil and vinegar and various spices. I don’t see how it could go bad in the fridge.
It stays good until it’s finished. Once in a while I turn up something literally years old and throw it out, otherwise if it’s acidic it’s fine. Creamy sauces I keep in the fridge, the rest I don’t bother. I think you are safe.