at the moment i use one of these if i'm not arsed about the weight too much.
it's not bad once a stupid pointless hole is filled.
if i'm feeling fancy i'll bring my 2x AA battery milk frother too and something to heat milk up in.
http://www.amazon.com/Zyliss-Travel-French-Coffee-Single/dp/B00F9ZTL6Unormally I just use a ti mug with a coffee filter elastic banded round the top of it if weight is a cunt.