Butter can not be made from dried milk.
Neither. Milk is an input for butter. One does not use milk on toast instead of butter which would make it a substitute. Nor does one always eat milk with butter which would make it a complement.
mix buttermilk and milk and u let it sit for a hour
milk
No, once you separate the cream and make butter from it, you can't go backwards to make milk again.
peanut butter, ice, milk
MILK
milk
Milk and a mixer
No, pigs do not make butter. Butter is made from churning cream, typically from cows. Pigs are mammals that do not produce milk with a high enough fat content for making butter.
Since butter is about 80% fat and whole milk is about 3.25% fat, you can get 0.039 liters of butter from 1 liter of milk. Most people make butter from cream, which is about 40% fat.
Food........