HELP! what can you substitute for teriyaki or soy sauce?

i'm @ my aunt's and i'm making stirfry, but they don't have any oriental sauces! they have some italian vinageratts and A1 sauce, but how will that work for stir fry??? What's a good substitute for an oriental sauce? Btw, I'm not able 2 go 2 the store, so as many suggestions as possible in great! and i'm short an time.....