One of my grandsons is going through this decision as he has just got his first little house. A bed, a table, a fridge and he also bought an air fryer. A washing machine is also high on the list ( there are no laundromats around these days )
Having just moved to the centre of a busy small town, currently almost anything, because everything is within walking distance. Clothes, carpets, books, anything of a carriable size provided by Argos.
It would probably be medication like Paracetamol or my eczema cream if I ran out. I have arthritis so unfortunately painkillers are essential at times. Very good question Mollygo.