Missy was on Purina Pro Plan when we got her, we kept her on that for a week or two until she got adjusted to the house, and then we switched her. She and Jack are now on Fromm dry, and they both get Primal raw a couple times a week.
When we first got Sassy, it was kind of an unexpected situation, and the only place open was a grocery store, so we got her some Friskies canned food. We got her on Blue Buffalo within a couple days, and then went through half a dozen foods before we found one that she liked and that agreed with her. She gets Acana dry, and Fromm wet.
As for treats, my mom got them a box of Nutro biscuits, they ate a few before I found them. The box of biscuits got donated to the rescue I volunteer with, and I bought them some healthier biscuits at work.