It has to be iced green tea with lime for me (they do nice cartons of it in Norway). Maybe an iced cappuchino if I'm in the mood. Don't really drink hot drinks too much (-strange I know!)
For biscuits, I find chocolate chip digestives are the best for a hot cup of coffee - chocolatey but you can dunk them properly without the chocolate melting all over your fingers. A twix straw is also rather nice with a cup of tea (also jaffa cakes (I know they aren't really biscuits) dunked in a glass of ice cold milk is really good - unfortunately, they are soo nice I end up eating an entire packet in one go)
And my favourite mug tends to be is whichever one is clean :p
