In saucepan, boil together water, sugar, and cocoa until mixture is completely dissolved. Add vanilla.
Add in soy milk, and heat. Do NOT boil.
Notes
Substitutions
This will also work with other milk alternatives such as rice milk to make this soy-free.
Milk and Soy Substitutions: Alternative dairy-free milk beverages and products will work in most recipes. Find out more about milk substitutions and soy substitutions.