What non alcoholic drinks do you drink at parties?

I find most non alcoholic beers, wines and spirits etc. give me what is essentially a good approximation of a hangover the next morning if I have more than a couple of them. I have no idea what causes this, but asking around my friends and Google it turns out I'm not entirely alone.

What do you drink when you go to parties etc. and know you're going to be out for a long time? I like NA beer because it's not sweet and so is drinkable for a long period of time. Unfortunately it seems that everything that isn't an NA version of an alcohol drink or isn't full of sugar or caffeine is essentially sweet tasting (i.e. sugar free ginger beer).