The best thing about being a vegan household is being freed from the tyranny of milk. It’s heavy, it goes off, it needs using up
I can honestly say, hand on heart, that I have never thrown away milk. If you buy what you use, then no need. We do occassionally have to go out for more, if we have guests, but over the years, you know how much you use in a week.
We have very little food waste. All of us, inc. teen DD's use the sniff test on yogurts, meats, bread etc. We will all happily eat out of date items. The cat eats what we can't face!
I have stopped buying bagged salad, as it is not stable beyond a couple of days, and a head of lettuce can last weeks in the fridge.
I compost all peelings, choppings, apple cores etc etc.
Food waste wise (although expensive) I do now buy pre-prepared frozen soffritto, and frozen onions, so have no waste there at all.