view Japanese fonts and input Japanese on non-Japanese computers

So I have many Japanese friends in Europe and when we use computers at shops many times they do not support Japanese so it is hard to communicate. So, I am looking for a way I can bring my own fonts and input method. There are a few programs that can do something like this but they are very expensive. I have been using most of my portable apps with Mojo pack, which lets you install programs directly into your usb key or whatnot. That way I can use a non portable app on a usb key. Does anyone have any ideas about how to do this?