Yes, chex mix is great. I didn't know there were gf pretzels - if you think of the brand name, please let me know. I've found some crackers that are. Pretzels by themselves would be good too, if I can find the gf brand.
For worchestershire saice, French's and Lea and Perkins (in the US; not other places) and both gf.
For worchestershire saice, French's and Lea and Perkins (in the US; not other places) and both gf.