Water

Your recommended water intake levels depend on a variety of factors. In general, experts agree that the average adult man needs 3.7 liters of water per day, while the average adult woman needs 2.7 liters per day. Other beverages, including herbal tea and sports drinks, may also count toward your overall water intake.

Keep in mind that these are just averages — you may need more if you exercise frequently or live in a hot climate. Other factors that can affect your ideal water intake include your health and size, medications you're taking, pregnancy and breastfeeding. Your doctor can provide a recommendation to fit your unique needs and lifestyle.

Sparkling water is simply water that's been infused with pressurized carbon dioxide gas. This process carbonates the water, creating its signature bubbles. You can also buy sparkling mineral water, which is naturally carbonated at its source.

Within the broader category of sparkling water, there are a few varieties. Seltzer is made with carbon dioxide and water. Club soda typically includes added minerals, such as sodium chloride or potassium sulfate, to create extra flavor. Tonic water has the strongest taste, thanks to added minerals and quinine.

Some manufacturers, including LaCroix and AHA, make flavored sparkling water.

Distilled water is made by boiling water, gathering the steam and allowing it to condense back into water. Any impurities are left behind in the initial boiling process, which means that the final product is free of most minerals and other trace substances. Distilled water is commonly used in mixing baby formula, ironing clothing and powering CPAP machines.

Alkaline water is water that has a higher pH level than other types of bottled water and flavored water. To achieve these levels, manufacturers add nutrients and minerals.

When you see the term "municipal water," you probably think of tap water. Believe it or not, some bottled water brands actually bottle and re-sell municipal water to consumers. To spot this type of water, look for the terms "distilled water" or "purified drinking water" on the label. These labels don't necessarily mean that there's something wrong with the water, it's just not sourced from a natural place such as a spring or artesian well. The water must still meet current US standards and go through a distillation, osmosis, or deionization process so that it's completely safe for humans (or pets) to drink.

Look closely at a bottle of water, and you'll probably see an expiration date stamped on the label. This is typically because the minerals, flavorings or carbonation can lose their strength over time, affecting the taste of the water. To help your bottled water last longer, store it in a cool, dark place away from direct sunlight, bathroom cleaners and other all-purpose cleaners.