I've never had Ovaltine, so maybe this won't be a good substitute, but when I want a hot drink that isn't coffee, tea or hot chocolate, I just heat up a mug of milk (or soy milk or almond milk), add some vanilla and possibly some honey or turbinado sugar, and spices - cardamom, nutmeg, or cinnamon are all very nice alone or in combination. It's a very comforting beverage.
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