10ouncesvodka(or enough to cover the marshmallows)
Instructions
Add the marshmallows to a large mason jar, and pour the vodka over top of them.
Stir up the mixture with a long spoon, and then seal up the jar.
Let the jar sit, shaking it up occasionally, at room temperature for about 2 days.
Once all the marshmallows are dissolved, you will have a layer of corn starch at the bottom of the liquid.
Set up a coffee filter over a container (a pour-over coffee maker is great for this) and pour the liquid into the filter.
It will probably take a really long time for all of the liquid to pass through. After about an hour of filtering you can just use what has filtered through. Discard the corn starch.
Pour the filtered liquid into a glass storage bottle using a funnel. You can use it right away, or store it indefinitely!