OP here to kick it off with mine: a power adapter in my pocket (not the suitcase), enough local cash for two days, offline maps downloaded, and photos of every important document in the cloud AND printed. That combo got me through before anything was set up.
Thinking about the very first two days on the ground — before the SIM, before the bank, before you know where anything is. What did you have on you that saved you, and what did you wish you'd packed in your hand luggage instead of the shipping container? Trying to build a proper list for someone arriving next month.