Get an ice wyvern first now that Rag ASA is out. Use it as a fridge for the milk. Lasts days not hours. Also bison, you’re going to need at least 2, one adult female and one baby. Female bison only produce milk once every hour with a baby nearby. Uncryo baby, grab the milk, cry the baby. The timer will go down without the baby present. Get about 4 milk before your Wyverns needs to eat, wyvern will never need more than 2 every 4 hours till adult.