Is there a chocolate flavour liquid without the sediment and no milk in it?
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LorAnn makes a consumer-grade chocolate flavoring:
You'd use it in a fashion similar to vanilla extract, though it's more concentrated. It's available at candy supply stores, and online. It has a very strong color, so be careful about adding it to things that you want to be white.
I use creme de cacao (basically, chocolate liqueur) for making frosting. It's quite sweet and is much less concentrated than the chocolate flavoring. (It's also a nice addition to milk, kind of a grown-up chocolate milk.) It's available at any liquor store.