Can we buy the Asian Zing Sauce by the bottle at the restaurant?

Yup

Yes and you can buy it elsewhere as well. You can buy their sauce bottled at any of their locations.

Yes

Yup. Btw costco also has a 3 pack of BWW sauce for 2.99. Each 3 pack has a bottle of Asian zing, garlic parmesan and bbq. Def a good deal if you like using their sauce at home.