Milk

"Nutritious juice, squeezed from a cow's dangly bits. Good for your bones." -Description

Use
Milk can be used to heal 50% of a player's health.

It can also be sacrificed at the Ruins.

Obtaining
Milk can be obtained in numerous ways:
 * Sold at the Ditto Mart for 50
 * Sold at a farm for 30 (not always available)
 * Dropped by enemies
 * Found by cutting/burning grass
 * Found in chests