Powdering milk is a great way to store it efficiently, either in a cellar or for long journeys.
The first step to making Powdered Milk is making Condensed Milk.
Then, the Condensed Milk is further boiled into Milk Flakes. If you keep the fire going, this will happen automatically.
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Finally, the Milk Flakes can be ground into Powdered Milk using a Quern.
Recipe: artisanal:crafting/milk_1
Powdered milk can also be crafted with a water jug to turn it into a milk jug, if you want to use it on the go.
Recipe: artisanal:crafting/milk_8
You can also craft any fluid container with up to 8 powdered milks, to make 100 mb of milk per powdered milk used.
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If you have the Firmalife addon installed, you can make Powdered Milk variants for Goat and Yak Milk as well.