Best Way To Buy Buttermilk

Instead of buying an entire quart of fresh buttermilk and having it go bad because I typically only use a few tablespoons at a time. I buy powdered buttermilk and then mix it with water whenever I need to use it for making pancakes, dressings, breading for fish, or for any other cooking I do. Here is my brand of choice.

Saco cultured Buttermilk blend.