We use mostly unsweetened oat milk. No whey, José! For porridge and cereal, or just to swig, it's great.

But in m'humble you need the cow tackle for cups of tea and coffee. So we buy ours in small amounts. By the way, you can freeze milk, and it comes to no harm. For tea, it's semi-skimmed. For decent coffee (we have a coffee machine that uses capsules), it has to be whole milk.