[BookCat]

For writing away from home, I strongly suggest buying an AlphaSmart Neo. These will run for about 700 hours on 3 AA batteries and are extremely portable. You just write on it, then when you get home you can attach it to your computer via usb, put the cursor in your chosen word processor, or notepad and press the Send button: then watch it type onto your screen.
They're no longer made, but you can pick up a second hand one fairly cheaply from ebay.

For computer programs, I recommend three, only one of which is free. Scrivener, The Novel Factory (Windows and online only) and FocusWriter (free). Take a look at them and see what you think. The first two have trial versions, FocusWriter, which is also multi-platform, doesn't need one.