Yeah as above, there's basically three resources you'll want to use.
The obvious is Tesla's Supercharger map for planning long trips.
Zap Map lists all public chargers, and of most use is the info/comments section which helps with working out what the cost is, if they're even there still, if they're functioning etc. It's community-led so you can report broken or ICEd chargers, or say you've had a successful charge and whatnot. As above, not all chargers are listed though but I would say that's actually quite rare, especially for something like a university.
The third and one of the most useful is ABRP (A Better Route Planner). It's Google Maps but for EVs so it'll plan your route using chargers, and Supercharges if you're a Tesla owner. Select your car, put in your home address and stick Dubrovnik as your destination and it'll show you all your stops, how long you have to charge for and to what % etc to get to the next charger and so on. I use it a lot, not just for as long journeys as that but also there-and-backs to work out where and when (and if) I need to stop.