Ice cube trays can be a parent’s best friend. From Gladys:
My baby never finished up a jar of juice in a reasonable time, so I found myself throwing out a lot of it — and it was organic and pricey! I started freezing the juice into ice cube trays, then putting the frozen juice cubes into a freezer bag. Take one out and pop it into a sippy cup, and you’ve got instant diluted juice, and it’s cold, too.
Works well for small bits of leftovers, cooked vegetables, sauces, and anything else you want to store in baby-sized portions.