Just add some water. Start with about 1 tablespoon per cup of cooked rice. Add a bit more if that is all quickly absorbed. All the flavoring you want is there from the first night. Heat it, stirring, and once it's hot, cover it and let it sit for 10 minutes. Heat some more if it's cooled off by then.
I agree with the others -- Worcestershire Sauce, which is wonderful stuff, is VERY strong flavored and should be used in small amounts. It would substantially change the dish you have. Also, it's NOT a substitute for Soy Sauce and would seem out of place in a stir fry if you used very much of it.