Seltzer Water too! Plain seltzer with 1/4 or 1/2 cup juice added is nice. Orange, lemon, lime, pomegranate, blueberry...all good. V8 between meals if you are hungry.
Ditto on the pure cranberry water from me....I currently have 2 bottles of it here. I save my 1 liter bottles and pour in about 5 oz of pure cranberry and the rest filtered water. It has a kick and a zip and no sugar.
It's no martini
...but it works.