It is hard to imagine how different it may have been living in past times. So I dug up some links to historical information on the basics. Over on livescience.com, they ask, "What Did Ancient Egyptians Really Eat?" Learn more here.
Also, on medievalists.net, they ask, "Did people drink water in the Middle Ages?" Find out here.
Finally, on historyextra.com, they give us "A handbook to shopping in ancient Rome" here.