I can't tell you how many times we have thrown away milk. There are only two of us in the house, and the only time we ever use it is when we need it for pancakes, in a recipe, or someone comes over and uses it in their coffee. Even if we only buy a quart or half gallon, we throw most of it away. Then something dawned on me, milk freezes very well! I got out my silicone cupcake cups, placed them on a couple plates, poured the milk into them, and froze them. Each cup holds 1/2 cup of milk. After they were frozen, just a few hours later, I removed them from the silicone cups and put them in a ziplock bag for use later. Since they are frozen in half cup servings, it's easy to grab what I need next time I want pancakes or oatmeal. You can thaw them out the day before, or in the microwave when you need them.
I've been doing this for years with our leftover gravy, pizza sauce, spaghetti sauce, and all kinds of sauces. The silicone doesn't absorb odors and they clean up so easily.
Here's a tip: The cheaper silicone cups are easiest to remove from the frozen milk because they are thinner. Just peels right off!
Clipart image from "Country Kitchen" available at Etsy.