Mix the ingredients for your ice cream base in a small to medium sized resealable plastic bag. Be sure to push out as much air as you can as you're sealing it. In a large resealable plastic bag ...
Just cut a hole in the corner of the plastic bag and pipe it out! But you don't really need ice cream to start with at all. You can mix heavy cream, whole milk, sugar, and vanilla in a bag ...
If you've got enough bags, why not have a race and see who can get the ice cream to freeze the fastest! After five minutes of shaking, carefully take the small bag out and taste your ice cream!