When exercising, follow the Galpin Equation as a guideline for the amount of additional fluid you should consume

The Galpin Equation:

• Body weight (in lbs.) divided by 30 = number of ounces to consume every 15-20 minutes
• Body weight (in kg.) × 2 = number of mL to consume every 15-20 minutes

Filtering Tap Water

Zero-cost option: rest 1-5 gallons of water, uncapped, at room temperature for ~1 day. Sediment will fall to the bottom, so you can pour off the top two-thirds for drinking.

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- _Note_: do not opt for boiling tap water as a filtration method because high heat can actually make contaminants worse.

For most people, it will be healthier to filter their tap water. (Brita pitcher filters)