I have never liked sports drinks--I don't want the sugar, and I don't use any artificial sweeteners, so NUUN is out as well. I also dislike the taste. I just found a recipe for a homemade alternative, based on lemon juice for potassium plus a pinch of salt:

Just mix together:
1 cup (8 oz) water (not carbonated)
2 Tablespoons lemon juice
small pinch of salt
Flavoring and sweetener to taste

Has anyone tried something like this? I think I'll mix some up for my ride this weekend, maybe with just a bit of honey to smooth it out.