@Matis- Here is the recipe I use for making homemade horchata. It has a great taste and really compliments spicy dishes. It does require some prep and resting time, so you will probably want to prepare this the night before or at least the morning of your dinner gathering.
I take a cup of uncooked white long-grain rice and add it to 5 cups of water in my blender. Then, I blend the mixture just until the rice begins to break up. It usually takes about a minute. After that, I let the mixture sit at room temperature for at least 4 hours.
After it sits, strain the rice water into a pitcher and get rid if the rice. Add in half a cup of milk, half a tablespoon each of vanilla extract and ground cinnamon, and two thirds of a cup of white sugar. Stir it all together and stick it in the fridge. I like to let the pitcher chill over night and serve over ice with the meal.