Traveling to Europe from the US, what can I do with the car seat?

I currently live in the US. I'm going to be in Europe for 2 months. What can I do with the car seat? We are already bringing the stroller and I can bring the car seat but I'd need the car attachment that goes underneath the car seat. Baby will be 6 months old. How do I carry all that? And where do I put the car seat attachment? For reference, we have the Chicco Corso travel system and the car seat is the Chicco key fit 35. Thinking of a solution. We are going to have a car in Europe and will be driving around so definitely need the car seat for the baby