STEPS
INGREDIENTS
Gather ingredients.... (measurements in supplies list ;))
Place a funnel in the bottle...
Add imitation butter....
Like so....
Add rum extract... ONLY 2 TEASPOONS!!!!! The other teaspoon is for the creme on top! :)
....
Place Cap on and seal....
Now to the creme topping!!!! Add marshmallow creme...
Add heavy cream....
Add imitation rum.... 1 teaspoon
Should look like this....
Yum, Enjoy!! Tastes amazing!!! :D
2.0l Creme soda
2.0Tbsp Butter extract 
3.0tsp Run extract
7.0oz Marshmallow creme (about 1 container)
1.0c Whipping creme  

How to make butter beer (harry potter)

Make Butter Beer (Harry Potter)