Food storage items like baggies/foil to wrap the leftovers. Depending on how long we stay - laundry and dishwasher detergent.
Oh ... coffee and filters!
Flat bottom basket coffee filters, an easy to use wine opener, rubber jar opener (my grip is not the same as it used to be), chip clips, and Glad plastic bowls with lids for left overs and even for larger cereal bowls.
Food storage items, laundry detergent and coffee with filters...those are what we bring.
You will be provided with a single load box of laundry detergent if you're in a 1 or 2 bedroom.