If you want to create a simple hot chocolate by your self, you can try this recipe

ingredients:
80 ml of cooking chocolate
60 gram of iching sugar
250 ml of water
120 ml of sweetened condensed milk
500 ml of fresh milk, heat it (you can use chocolate fresh milk or plain fresh milk)
1/4 tablespoon of vanilla extract

steps:
1. mix the chocolate, iching sugar, water, and sweetened condensed milk in a pan. head and stir for about 2 minutes with small fire.
2. add the milk and vanilla extract into the pan and stir without turning on the stove for about 1 minute.
3. Pour into 4 glass and the hot chocolate is ready to be drunk

happy cooking :)