When I'm in the studio I bring along plenty of ziploc bags, salt & pepper, coffee filters and a few containers I can microwave cook/store in (the Ziploc and Reynolds ones are good for this). The microwave is a small one so don't bring large microwave dishes/pans.
I've heard that some people like to take a George Forman grill, crockpot &/or electric skillet too. Since you don't have a cooktop in the kitchenette these items might be handy if you do plan to cook meals.