Keep Milk From Spoiling

If you have trouble keeping milk on hand because it spoils before you can use it, put a pinch of salt in it and shake. You can't taste it and it will keep the milk fresh longer.

When you drain the tuna

The liquid from canned tuna can be saved in the freezer until you have enough to add to soup or use as the liquid in white sauce. Bits of tuna will be in it and may be enough to flavor the soup, or you can add it to a smaller can of tuna than you usually use for cream of tuna.