Anthony'sOrganic Oat Fiber, 1.5 lb, Gluten Free, Non GMO, Keto Friendly, Product of the USA

What is the shelf life if no refrigeration needed? I had another brand that smelled and tasted rancid and I ended up tossing.

What does this taste like, and does it thicken up?

How can there be 0 Calories if there is 3g carbs??

Where do the oats come from? Where are they grown? Which country?