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Add cream/milk, sugar, and vanilla into a ziplock bag. I just add whatever would taste good. Close it.
In a seperate, bigger bag, put ice (preferably crushed) and salt (tbh, idk how much, i just put whatever feels right, its a large amount, so the ice is coated with it).
Put the smaller closed bag with the ingredients into the bigger bag with the ice/salt.
Close the bigger bag.
You should now have a bag in a bag, the soon-to-be icecream not mixing with the salt/ice (cause its seperated by the bag.)
Now, shake the bag has fast as you can or like half an hour, or until the icecream forms.
You can also take ice, sea salt, and heavy whipping cream, vanilla and 2 plastic bags and 2 coffee cans. You put sea salt an dice in one bag and double bag it. In the first coffee can put ice. put the second coffee can in that can and put the bag in the 2nd coffee can, in another bag put all other ingredients