Nestle also makes a diet hot cocoa - 20 calories! Top with a bit of fat free whipped cream (the kind in a can - 5 calories per 1 tblsp) and it is good.
I've also made myself chai tea of an evening. I have different spiced teabags (current favorite:
decaf sweet coconut thai chai) and brew a pot. Then I add some sugar substitute to my mug, pour a glass, and make it milky with some sugar-free vanilla almond milk or skim milk. Delicious. You could start by sweetening the whole pot, but I like to have it cold too and when I drink tea cold I DO NOT like it sweet. Actually, I prefer most teas unsweetened, except for the spiced ones. Anyway, it mimics a nice hot chai drink you might get while out, for many fewer calories and is great in the evening since I usually use decaf tea.