I just went and mixed one with water just to try it out. It definately didnt mix as well as it does with milk! If you are not Lactose sensetive I would go with the milk option, extra protein that way too. The maple syrup also has HFCS in it so not sure that would be a great option at bedtime, or anytime for that matter.
If you want to eat it outside of a shake, just sprinkle some cinamon and splenda (or Honey) and chow it down.
If you go the shake option I usually put natty peanutbutter, oats, whey, cottage cheese, and milk.