You’ll need four 16-ounce bottles to fill up a one-gallon jug. That’s because there are 128 ounces in a gallon, and each 16-ounce bottle holds one-eighth of that total. So picture those plastic bottles lined up on your countertop – it takes four to make a full gallon for mixing up lemonade or storing water.
Use this handy rule of four bottles per gallon to stock up properly next time you’re at the store.