I voted sugar and cream, even though usually I use milk. Most people in Germany use condensed milk, but I like the regular milk better. Full fat of course. We have fat-reduced milk here, but I don't like it.
But the stuff they sometimes sell for "milk" in the US (skim) is worse! It's white colored water, I bet there is not one gram fat in it. And it tastes like it.
Flavoured milk is not common in Germany. We have different instant powders to flavour milk: cocoa, strawberry, vanilla, banana, etc. But there are convenience products where the powder is already in the milk and it's ready to drink. Those are usually sold in small battles, one portion sized.