Second Language

Is there someone here who suddenly moved to a different country but you know little about their language? How did you deal with it? What are the practices that you do to learn it fast? Or did you learn right away? 

I moved to Tanzania in 1999. I was in a big group though, and we studied Swahili for 3 months together as soon as we got there. I lived there for 3 years.

This is actually one of my biggest fears. Like, what if I suddenly need to move to a different country which language is new to me. How will I cope up? I don't know why I overthink like this.

I moved to Spain 4 years ago with barely more than my numbers, a few greetings and useful tourist phrases , my children had their colors numbers shapes and alphabet as well as I am I want I need and a few classroom activity adjectives, they are completely fluent and in fact have more Spanish than English now

I worked in Japan for 4 years. People have limited English skills there and my Japanese is zero. I had to study basic Japanese and really listen to people's conversations to pick words. I also joined communities of foreign people in Japan. They helped out in my language learning and also living in Japan. Actually now that I mentioned this, I miss living there. :)