I added another toiletry style bag to our mix with travel essentials: laundry pods and dryer sheets, small thermometer and routine meds (fever, etc), travel pack of Clorox wipes, and the Bownty paper towels with Dawn built in.
Also: wrinkle release spray, extra clips for hanging towels and swimsuits, magnetic hooks/clips for lanyards and such
Lights is another...we’ve done cheap tea lights and book lights in the bathrooms, although next trip I’ll take a decent nightlight. I also found some flat magnetic flashlights at the Dollar Tree that were great to stick on the door.