California's severe drought has probably made a lot of us more aware of our water footprint, which is the amount of fresh water we use plus the amount used for the goods and services we consume every day.

The obvious contributors to our water footprint are washing clothes and dishes, cooking and bathing. But the biggest contributor to our water footprint is our diet.

On average, the water we use in our households is about 98 gallons a day, says a U.S. Geological Survey. The industrial goods we use -- paper, cotton, clothes -- that's about another 44 gallons a day. But it takes more than 1,000 gallons of water a day per person to produce the food (and drinks) in the average U.S. diet, according to several sources. More than 53 gallons of water go into making 1 cup of orange juice, for example.

Just to get a sense of how much water goes into growing and processing what we eat, here's a list of the water footprint for some common foods, via National Geographic:

A 1/3-pound** burger** requires **660 gallons** of water. Most of this water is for producing beef (see below).

1 pound of** beef** requires **1,799 gallons** of water, which includes irrigation of the grains and grasses in feed, plus water for drinking and processing.

1 slice of** bread** requires **11 gallons** of water. Most of this water is for producing wheat (see below).

1 pound of **wheat** requires **132 gallons** of water.

1 gallon of **beer** requires **68 gallons** of water, or 19.8 gallons of water for 1 cup. Most of that water is for growing barley (see below).

1 pound of **barley** requires **198 gallons** of water.

1 gallon of **wine** requires **1,008 gallons** of water (mostly for growing the grapes), or 63.4 gallons of water for 1 cup.

1 **apple** requires **18 gallons** of water. It takes 59.4 gallons of water to produce 1 cup of apple juice.

1 **orange** requires **13 gallons** of water. It takes 53.1 gallons of water for 1 cup of orange juice.

1 pound of **chicken** requires **468 gallons** of water.

1 pound of **pork** requires **576 gallons** of water.

1 pound of **sheep** requires **731 gallons** of water.

1 pound of **goat** requires **127 gallons** of water.

1 pound of **rice** requires **449 gallons** of water.

1 pound of **corn** requires **108 gallons** of water.

1 pound of **soybeans** requires **216 gallons** of water.

1 pound of **potatoes** requires **119 gallons** of water.

1 **egg** requires 53 gallons of water.

1 gallon of **milk** requires **880 gallons** of water, or 54.9 gallons of water for 1 cup. That includes water for raising and grazing cattle, and bottling and processing.

1 pound of **cheese** requires **600 gallons** of water. On average it requires 1.2 gallons of milk to make 1 pound of cheese.

1 pound of **chocolate** requires **3,170 gallons** of water.

1 pound of **refined sugar** requires **198 gallons** of water.

1 gallon of **tea** requires 128 gallons of water, or 7.9 gallons of water for 1 cup.

1 gallon of **coffee** requires **880 gallons** of water, or 37 gallons of water for 1 cup. "If everyone in the world drank a cup of coffee each morning, it would 'cost' about 32 trillion gallons of water a year," National Geographic notes.

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