I use unsweetened, vanilla flavored almond milk. Per 8 ounces...
3 grams fat
2 grams carbs, 1 gram fiber (If I recall)
Protein...I think it was 2 or so carbs
By itself it tastes alright...but in shakes in cereals I downright love the stuff. Makes shakes thick and creamy like milk. Definitely recommend it.
If not that, you could try using water+green tea. That's what John Berardi has suggested in the past, I myself haven't tried it yet though.