Being vegan, it's not always easy to find a chocolate drink that satisfies you, and lives up to ones expectations.
My two favourite are
Provamel Organic Soya Chocolate Drink
and Rice Dream.
Both companies have an excellent range of dairy free, vegan suitable products. And both companies produce a vegan suitable chocolate "milk". Rice dream is slightly sweeter that the provamel, but I enjoyed them both. As with all milky type drinks they taste better cold, so refrigerate before use, would be recommended.