I've been playing ark for a long time and just realized that ice wyverns save food like a refridgerator in their inventories, even wyvern milk. The milk will last over 3 days. If you are raising one just fill it with all of the milk you can and it will feed itself for up to 3 days. No more missing that overnight feeding! Also I don't see it on here but if you don't have an ice wyvern then wyvern milk will last longest when stored in a sealed wooden barrel.