What a wonderful opportunity!
If it were me, I’d check up on all the immunisations I need and make sure I get them in time.
I’d also pack a reusable water bottle that kept water cool so I could decant bought water into it.
As far as Type One is concerned: frios for the Novopens and insulin plus an insulated bag to carry temperature-affected Type one stuff, and spare dexcom - spares of everything type one!
I’d also have a good supply of jellybabies, chargers for all electrics that need them, multi-plugs for the systems in visited countries, a list of phrases asking where to find essentials in the local languages, cool clothing and a shade provider (umbrella?) and hand held fan plus a pullover and long trousers for cooler nights, a bug spray/moonflower/plug-in bug deterrent, suncream, strong shoes and sandals.
The list could expand . .
I’d also visit a bank or building society to see if I could get a pre charged card that could be used in the different places I’m visiting.
Have a really great time! Wish I was coming too