Obtaining a 
Thermos
Thermos containers let you carry liquids safely during your adventures. To create one, you'll need a 
glass container and access to the liquid you want to store.
Filling Your Thermos
Water Thermos: Find a water source (river, ocean, or bucket). Hold an empty glass and right-click on the water block. This creates a Water Thermos you can carry.
Lava Thermos: Locate lava and right-click on it with an empty glass. You'll obtain a Lava Thermos—useful for smelting operations or as fuel.
Milk Thermos: Find cows or goats in the world. Right-click on them with an empty glass to collect milk into a Thermos. This is faster than using buckets and takes up less inventory space.
Using Your Thermos
Once filled, your Thermos acts as portable liquid storage. You can carry multiple Thermos containers at once, making them ideal for long expeditions where you need water, milk for potions, or lava for construction projects. The Thermos won't spill or leak, so it's perfect for traveling between bases or exploring dangerous terrain.